This is the continuation of the topic (now closed) :
So the problem occured again. This time it was with different roon point.
In short the song has stopped playing with 1 sec remaining to finish the song.
The Roon core is on NUC 10 (16GB ram, 1TB SSD, i9 CPU - 12core) with ubuntu server 20.04 and roon . This is a full wired network (1GB network, Broadband on 600Mbps) both for roon core and roon end point. End point in this case is a local iMac . I was playing a QOBUZ song 24bit/192kHz. No DSP, only volume leveling in the output.
this is the log file content from when the song has stopped playing until I moved to the next song:
01/11 15:44:06 Trace: [MacOutput] [zoneplayer/raat] sync System Output: realtime=1433210857393 rtt=500us offset=128158857us delta=198us drift=10788us in 1065.7335s (10.123ppm, 36.442ms/hr)
01/11 15:44:13 Info: [stats] 4983mb Virtual, 1078mb Physical, 523mb Managed, 0 Handles, 79 Threads
01/11 15:44:20 Trace: [roonapi] [apiclient 192.168.0.69:49962] CONTINUE Changed {"message":"Running (23)","is_error":false}
01/11 15:44:21 Trace: [MacOutput] [HighQuality 18.2x, 24/192 QOBUZ FLAC => 24/48] [2% buf] [PLAYING @ 4:46/4:47] Salt of the Earth - The Rolling Stones
01/11 15:44:28 Info: [stats] 4983mb Virtual, 1078mb Physical, 524mb Managed, 0 Handles, 79 Threads
01/11 15:44:35 Trace: [MacOutput] [HighQuality 18.2x, 24/192 QOBUZ FLAC => 24/48] [2% buf] [PLAYING @ 4:46/4:47] Salt of the Earth - The Rolling Stones
01/11 15:44:36 Trace: [MacOutput] [zoneplayer/raat] sync System Output: realtime=1463352265451 rtt=500us offset=128157265us delta=458us drift=9196us in 1095.8765s (8.392ppm, 30.210ms/hr)
01/11 15:44:43 Info: [stats] 4983mb Virtual, 1078mb Physical, 524mb Managed, 0 Handles, 79 Threads
01/11 15:44:51 Trace: [MacOutput] [HighQuality 18.2x, 24/192 QOBUZ FLAC => 24/48] [2% buf] [PLAYING @ 4:46/4:47] Salt of the Earth - The Rolling Stones
01/11 15:44:56 Trace: [push] restarting connection (Connection timed out)
01/11 15:44:56 Trace: [push] retrying connection in 61419ms
01/11 15:44:58 Info: [stats] 4983mb Virtual, 1078mb Physical, 525mb Managed, 0 Handles, 78 Threads
01/11 15:45:03 Trace: [MacOutput] [HighQuality 18.2x, 24/192 QOBUZ FLAC => 24/48] [2% buf] [PLAYING @ 4:46/4:47] Salt of the Earth - The Rolling Stones
01/11 15:45:06 Trace: [MacOutput] [zoneplayer/raat] sync System Output: realtime=1493527100033 rtt=500us offset=128155100us delta=-505us drift=7030us in 1126.054s (6.244ppm, 22.477ms/hr)
01/11 15:45:13 Info: [stats] 4983mb Virtual, 1078mb Physical, 526mb Managed, 0 Handles, 78 Threads
01/11 15:45:20 Trace: [roonapi] [apiclient 192.168.0.69:49962] CONTINUE Changed {"message":"Running (24)","is_error":false}
01/11 15:45:21 Trace: [MacOutput] [HighQuality 18.2x, 24/192 QOBUZ FLAC => 24/48] [2% buf] [PLAYING @ 4:46/4:47] Salt of the Earth - The Rolling Stones
01/11 15:45:28 Info: [stats] 4983mb Virtual, 1078mb Physical, 526mb Managed, 0 Handles, 78 Threads
01/11 15:45:36 Trace: [MacOutput] [HighQuality 18.2x, 24/192 QOBUZ FLAC => 24/48] [2% buf] [PLAYING @ 4:46/4:47] Salt of the Earth - The Rolling Stones
01/11 15:45:37 Trace: [MacOutput] [zoneplayer/raat] sync System Output: realtime=1523690290383 rtt=500us offset=128154290us delta=-87us drift=6221us in 1156.2175s (5.381ppm, 19.370ms/hr)
01/11 15:45:44 Info: [stats] 4983mb Virtual, 1078mb Physical, 526mb Managed, 0 Handles, 78 Threads
01/11 15:45:51 Trace: [MacOutput] [HighQuality 18.2x, 24/192 QOBUZ FLAC => 24/48] [2% buf] [PLAYING @ 4:46/4:47] Salt of the Earth - The Rolling Stones
01/11 15:45:58 Trace: Successful POST response from https://push.roonlabs.com/push/1/connect
01/11 15:45:58 Trace: [push] connecting to 34.74.254.52:9200
01/11 15:45:58 Trace: [push] connected
01/11 15:45:59 Info: [stats] 4983mb Virtual, 1078mb Physical, 528mb Managed, 0 Handles, 80 Threads
01/11 15:46:07 Trace: [MacOutput] [zoneplayer/raat] sync System Output: realtime=1553853199308 rtt=500us offset=128153199us delta=-119us drift=5129us in 1186.3825s (4.324ppm, 15.567ms/hr)
01/11 15:46:12 Trace: [MacOutput] [HighQuality 18.2x, 24/192 QOBUZ FLAC => 24/48] [2% buf] [PLAYING @ 4:46/4:47] Salt of the Earth - The Rolling Stones
01/11 15:46:14 Info: [stats] 4985mb Virtual, 1080mb Physical, 530mb Managed, 0 Handles, 80 Threads
01/11 15:46:20 Trace: [roonapi] [apiclient 192.168.0.69:49962] CONTINUE Changed {"message":"Running (25)","is_error":false}
01/11 15:46:21 Trace: [MacOutput] [HighQuality 18.2x, 24/192 QOBUZ FLAC => 24/48] [2% buf] [PLAYING @ 4:46/4:47] Salt of the Earth - The Rolling Stones
01/11 15:46:29 Info: [stats] 4985mb Virtual, 1081mb Physical, 531mb Managed, 0 Handles, 80 Threads
01/11 15:46:29 Trace: [zone MacOutput] PlayPause
01/11 15:46:29 Trace: [zone MacOutput] Pause
01/11 15:46:29 Info: [zone MacOutput] Canceling Pending Sleep
01/11 15:46:29 Trace: [MacOutput] [zoneplayer/raat] Pausing at streamtime_ns 1010125652604 now_ns 1576132751759
01/11 15:46:29 Trace: [MacOutput] [HighQuality, 24/192 QOBUZ FLAC => 24/48] [2% buf] [PLAYING @ 4:46/4:47] Salt of the Earth - The Rolling Stones
01/11 15:46:29 Trace: [System Output] [raatclient] SENT [11]{"request":"stop"}
01/11 15:46:29 Trace: [MacOutput] [zoneplayer/raat] Endpoint System Output State Changed: Playing => Paused
01/11 15:46:29 Info: [zone MacOutput] OnPlayFeedback Paused
01/11 15:46:29 Trace: [MacOutput] [HighQuality, 24/192 QOBUZ FLAC => 24/48] [2% buf] [PAUSED @ 4:46/4:47] Salt of the Earth - The Rolling Stones
01/11 15:46:29 Trace: [System Output] [raatclient] GOT [7] {"status":"Stopped"}
01/11 15:46:29 Trace: [System Output] [raatclient] GOT [11] {"status":"Success"}
01/11 15:46:29 Trace: [roonapi] [apiclient 192.168.0.73:36080] CONTINUE Changed {"zones_changed":[{"zone_id":"1601bf2f19077a2686dbf5b457a59352fda8","display_name":"MacOutput","outputs":[{"output_id":"1701bf2f19077a2686dbf5b457a59352fda8","zone_id":"1601bf2f19077a2686dbf5b457a59352fda8","can_group_with_output_ids":["1701bf2f19077a2686dbf5b457a59352fda8","1701e9eeb72410d991de2017717434ba64f9"],"display_name":"MacOutput","volume":{"type":"number","min":0,"max":100,"value":100,"step":1,"is_muted":false,"hard_limit_min":0,"hard_limit_max":100,"soft_limit":100},"source_controls":[{"control_key":"1","display_name":"System Output","supports_standby":false,"status":"indeterminate"}]}],"state":"paused","is_next_allowed":true,"is_previous_allowed":true,"is_pause_allowed":false,"is_play_allowed":true,"is_seek_allowed":true,"queue_items_remaining":13,"queue_time_remaining":3178,"settings":{"loop":"disabled","shuffle":false,"auto_radio":true},"now_playing":{"seek_position":286,"length":287,"one_line":{"line1":"Salt of the Earth - The Rolling Stones"},"two_line":{"line1":"Salt of the Earth","line2":"The Rolling Stones"},"three_line":{"line1":"Salt of the Earth","line2":"The Rolling Stones","line3":"Beggars Banquet"},"image_key":"4e58d73e0e90052294a1425dbcbc939078ed042d692b685c5497ac5628be8b4728dce89c57a67c6fd1c4aed54461b3850e03084a41aeaa273509da5b041b7568b1901362968d11454a7a0222ad5603603212a7a072bd54054230bc46552d5b3e85a84cfb8e39dab858a59dcb505989a3","artist_image_keys":["4e58d73e0e90052294a1425dbcbc939078ed042d692b685c5497ac5628be8b4794fab8f5b705d380d5942fd6b87d02d19623299361ca3e2313368d44331d36fbe114ea2a6922614529916580561ec7561249f743fd0c6ef4854d3a7f5c1a1a91d8592aab2c0252b2fbdac33c2e13d83f"]}}]}
01/11 15:46:29 Trace: [roonapi] [apiclient 192.168.0.69:49962] CONTINUE Changed {"zones_changed":[{"zone_id":"1601bf2f19077a2686dbf5b457a59352fda8","display_name":"MacOutput","outputs":[{"output_id":"1701bf2f19077a2686dbf5b457a59352fda8","zone_id":"1601bf2f19077a2686dbf5b457a59352fda8","can_group_with_output_ids":["1701bf2f19077a2686dbf5b457a59352fda8","1701e9eeb72410d991de2017717434ba64f9"],"display_name":"MacOutput","volume":{"type":"number","min":0,"max":100,"value":100,"step":1,"is_muted":false,"hard_limit_min":0,"hard_limit_max":100,"soft_limit":100},"source_controls":[{"control_key":"1","display_name":"System Output","supports_standby":false,"status":"indeterminate"}]}],"state":"paused","is_next_allowed":true,"is_previous_allowed":true,"is_pause_allowed":false,"is_play_allowed":true,"is_seek_allowed":true,"queue_items_remaining":13,"queue_time_remaining":3178,"settings":{"loop":"disabled","shuffle":false,"auto_radio":true},"now_playing":{"seek_position":286,"length":287,"one_line":{"line1":"Salt of the Earth - The Rolling Stones"},"two_line":{"line1":"Salt of the Earth","line2":"The Rolling Stones"},"three_line":{"line1":"Salt of the Earth","line2":"The Rolling Stones","line3":"Beggars Banquet"},"image_key":"4e58d73e0e90052294a1425dbcbc939078ed042d692b685c5497ac5628be8b4728dce89c57a67c6fd1c4aed54461b3850e03084a41aeaa273509da5b041b7568b1901362968d11454a7a0222ad5603603212a7a072bd54054230bc46552d5b3e85a84cfb8e39dab858a59dcb505989a3","artist_image_keys":["4e58d73e0e90052294a1425dbcbc939078ed042d692b685c5497ac5628be8b4794fab8f5b705d380d5942fd6b87d02d19623299361ca3e2313368d44331d36fbe114ea2a6922614529916580561ec7561249f743fd0c6ef4854d3a7f5c1a1a91d8592aab2c0252b2fbdac33c2e13d83f"]}}]}
01/11 15:46:31 Trace: [zone MacOutput] PlayPause
01/11 15:46:31 Trace: [zone MacOutput] Unpause
01/11 15:46:31 Trace: [MacOutput] [zoneplayer/raat] wait for ready in 0ms
01/11 15:46:31 Trace: [MacOutput] [zoneplayer/raat] Adjusting playback start offset from 50ms to 206ms
01/11 15:46:31 Info: [zone MacOutput] OnPlayFeedback Playing
01/11 15:46:31 Trace: [MacOutput] [zoneplayer/raat] Doing 'ASAP' Start since we are just playing to one device
01/11 15:46:31 Trace: [MacOutput] [HighQuality, 24/192 QOBUZ FLAC => 24/48] [2% buf] [PLAYING @ 4:46/4:47] Salt of the Earth - The Rolling Stones
01/11 15:46:31 Trace: [musicpowerstate] music is playing, preventing idle sleep
01/11 15:46:31 Trace: [System Output] [raatclient] SENT [12]{"request":"start","min_offset":206000000,"stream_sample":57978259}
01/11 15:46:31 Trace: [MacOutput] [zoneplayer/raat] Endpoint System Output State Changed: Paused => Playing
01/11 15:46:31 Trace: [System Output] [raatclient] GOT [7] {"status":"Playing"}
01/11 15:46:31 Trace: [System Output] [raatclient] GOT [12] {"status":"Success","time":1578365900681}
01/11 15:46:31 Trace: [roonapi] [apiclient 192.168.0.73:36080] CONTINUE Changed {"zones_changed":[{"zone_id":"1601bf2f19077a2686dbf5b457a59352fda8","display_name":"MacOutput","outputs":[{"output_id":"1701bf2f19077a2686dbf5b457a59352fda8","zone_id":"1601bf2f19077a2686dbf5b457a59352fda8","can_group_with_output_ids":["1701bf2f19077a2686dbf5b457a59352fda8","1701e9eeb72410d991de2017717434ba64f9"],"display_name":"MacOutput","volume":{"type":"number","min":0,"max":100,"value":100,"step":1,"is_muted":false,"hard_limit_min":0,"hard_limit_max":100,"soft_limit":100},"source_controls":[{"control_key":"1","display_name":"System Output","supports_standby":false,"status":"indeterminate"}]}],"state":"playing","is_next_allowed":true,"is_previous_allowed":true,"is_pause_allowed":true,"is_play_allowed":false,"is_seek_allowed":true,"queue_items_remaining":13,"queue_time_remaining":3178,"settings":{"loop":"disabled","shuffle":false,"auto_radio":true},"now_playing":{"seek_position":286,"length":287,"one_line":{"line1":"Salt of the Earth - The Rolling Stones"},"two_line":{"line1":"Salt of the Earth","line2":"The Rolling Stones"},"three_line":{"line1":"Salt of the Earth","line2":"The Rolling Stones","line3":"Beggars Banquet"},"image_key":"4e58d73e0e90052294a1425dbcbc939078ed042d692b685c5497ac5628be8b4728dce89c57a67c6fd1c4aed54461b3850e03084a41aeaa273509da5b041b7568b1901362968d11454a7a0222ad5603603212a7a072bd54054230bc46552d5b3e85a84cfb8e39dab858a59dcb505989a3","artist_image_keys":["4e58d73e0e90052294a1425dbcbc939078ed042d692b685c5497ac5628be8b4794fab8f5b705d380d5942fd6b87d02d19623299361ca3e2313368d44331d36fbe114ea2a6922614529916580561ec7561249f743fd0c6ef4854d3a7f5c1a1a91d8592aab2c0252b2fbdac33c2e13d83f"]}}]}
01/11 15:46:31 Trace: [roonapi] [apiclient 192.168.0.69:49962] CONTINUE Changed {"zones_changed":[{"zone_id":"1601bf2f19077a2686dbf5b457a59352fda8","display_name":"MacOutput","outputs":[{"output_id":"1701bf2f19077a2686dbf5b457a59352fda8","zone_id":"1601bf2f19077a2686dbf5b457a59352fda8","can_group_with_output_ids":["1701bf2f19077a2686dbf5b457a59352fda8","1701e9eeb72410d991de2017717434ba64f9"],"display_name":"MacOutput","volume":{"type":"number","min":0,"max":100,"value":100,"step":1,"is_muted":false,"hard_limit_min":0,"hard_limit_max":100,"soft_limit":100},"source_controls":[{"control_key":"1","display_name":"System Output","supports_standby":false,"status":"indeterminate"}]}],"state":"playing","is_next_allowed":true,"is_previous_allowed":true,"is_pause_allowed":true,"is_play_allowed":false,"is_seek_allowed":true,"queue_items_remaining":13,"queue_time_remaining":3178,"settings":{"loop":"disabled","shuffle":false,"auto_radio":true},"now_playing":{"seek_position":286,"length":287,"one_line":{"line1":"Salt of the Earth - The Rolling Stones"},"two_line":{"line1":"Salt of the Earth","line2":"The Rolling Stones"},"three_line":{"line1":"Salt of the Earth","line2":"The Rolling Stones","line3":"Beggars Banquet"},"image_key":"4e58d73e0e90052294a1425dbcbc939078ed042d692b685c5497ac5628be8b4728dce89c57a67c6fd1c4aed54461b3850e03084a41aeaa273509da5b041b7568b1901362968d11454a7a0222ad5603603212a7a072bd54054230bc46552d5b3e85a84cfb8e39dab858a59dcb505989a3","artist_image_keys":["4e58d73e0e90052294a1425dbcbc939078ed042d692b685c5497ac5628be8b4794fab8f5b705d380d5942fd6b87d02d19623299361ca3e2313368d44331d36fbe114ea2a6922614529916580561ec7561249f743fd0c6ef4854d3a7f5c1a1a91d8592aab2c0252b2fbdac33c2e13d83f"]}}]}
01/11 15:46:31 Trace: [System Output] [raatclient] GOT [7] {"status":"Dropout","samples":4722}
01/11 15:46:37 Trace: [MacOutput] [zoneplayer/raat] sync System Output: realtime=1584207620823 rtt=500us offset=128151620us delta=17us drift=3551us in 1216.738s (2.919ppm, 10.508ms/hr)
01/11 15:46:39 Trace: [MacOutput] [HighQuality, 24/192 QOBUZ FLAC => 24/48] [2% buf] [PLAYING @ 4:46/4:47] Salt of the Earth - The Rolling Stones
01/11 15:46:44 Info: [stats] 4985mb Virtual, 1081mb Physical, 531mb Managed, 0 Handles, 80 Threads
01/11 15:46:44 Trace: [zone MacOutput] Next
01/11 15:46:44 Info: [library] recorded play for profile aedb201d-e179-48a7-bbcf-ee176920a45c: mediaid=202:0:55976381 metadataid= contentid=202:0:55976381 libraryid= isfromswim=False
01/11 15:46:44 Info: [zone MacOutput] OnPlayFeedback Stopped
01/11 15:46:44 Info: [zone MacOutput] Canceling Pending Sleep
01/11 15:46:44 Debug: [zone MacOutput] _Advance
01/11 15:46:44 Trace: [zone MacOutput] Selecting Source state=Stopped
01/11 15:46:44 Info: [MacOutput] [zoneplayer] BufferingTrack == NextTrack during ClearQueuedMedia, setting _stop_on_next_track_transition
01/11 15:46:44 Trace: [MacOutput] [HighQuality, 24/192 QOBUZ FLAC => 24/48] [2% buf] [PLAYING @ 4:46/4:47] Salt of the Earth - The Rolling Stones
01/11 15:46:44 Info: [audio/env] [zoneplayer] All streams were disposed
01/11 15:46:44 Info: [audio/env] [zoneplayer -> stream] All streams were disposed
01/11 15:46:44 Trace: [MacOutput] [zoneplayer/raat] Endpoint System Output State Changed: Playing => Prepared
01/11 15:46:44 Trace: [System Output] [raatclient] SENT [13]{"request":"end_stream"}
01/11 15:46:44 Debug: [raat/tcpaudiosource] disconnecting
01/11 15:46:44 Trace: [System Output] [raatclient] GOT [7] {"status":"Ended"}
01/11 15:46:44 Info: [audio/env] [zoneplayer -> stream -> endpoint] All streams were disposed
01/11 15:46:44 Trace: [System Output] [raatclient] GOT [13] {"status":"Success"}
01/11 15:46:44 Trace: [MacOutput] [HighQuality, 24/192 QOBUZ FLAC => 24/48] [2% buf] [LOADING @ 0:00] Sad Sad Sad - The Rolling Stones