Hello @Lueneburg-based,
While looking at your diagnostic logs, we noticed a large amount of “NAK” and packet re-transmission in the logs
03/27 15:47:51 Trace: [Devialet wifi] [Lossless, 16/44 FLAC => 16/44] [100% buf] [PLAYING @ 5:14/6:57] Symphony No. 8: Movement III - Philip Glass / Dennis Russell Davies / Bruckner Orchester Linz
03/27 15:47:51 Debug: [devialet] NAK[1]
03/27 15:47:52 Debug: [devialet] NAK[1]
03/27 15:47:54 Debug: [devialet] NAK[1]
03/27 15:47:54 Debug: [devialet] NAK[1]
03/27 15:47:54 Debug: [devialet] NAK[1]
03/27 15:47:54 Debug: [devialet] NAK[1]
03/27 15:47:54 Warn: [devialet] sent packet 114401 3 times!
03/27 15:47:54 Debug: [devialet] NAK[11]
03/27 15:47:54 Debug: [devialet] NAK[11]
03/27 15:47:54 Debug: [devialet] NAK[11]
03/27 15:47:54 Warn: [devialet] sent packet 114401 4 times!
03/27 15:47:54 Debug: [devialet] NAK[11]
03/27 15:47:54 Warn: [devialet] sent packet 114469 3 times!
03/27 15:47:54 Warn: [devialet] sent packet 114472 3 times!
03/27 15:47:54 Warn: [devialet] sent packet 114474 3 times!
03/27 15:47:54 Warn: [devialet] sent packet 114476 3 times!
03/27 15:47:54 Warn: [devialet] sent packet 114478 3 times!
03/27 15:47:54 Debug: [devialet] NAK[11]
03/27 15:47:54 Warn: [devialet] sent packet 114480 3 times!
03/27 15:47:54 Warn: [devialet] sent packet 114481 3 times!
03/27 15:47:54 Warn: [devialet] sent packet 114483 3 times!
03/27 15:47:54 Warn: [devialet] sent packet 114484 3 times!
03/27 15:47:54 Warn: [devialet] sent packet 114490 3 times!
03/27 15:47:54 Debug: [devialet] NAK[11]
03/27 15:47:54 Warn: [devialet] sent packet 114401 5 times!
03/27 15:47:54 Debug: [devialet] NAK[31]
03/27 15:47:54 Warn: [devialet] sent packet 114469 4 times!
This is a sign something is getting overwhelmed or bottlenecked on the Expert side, Roon and your NUC are performing as expected. Our CTO went into some further details about the possible causes of these interruptions here. I recommend reaching out to Devialet with this report and troubleshooting further with them.
If you would like to experiment, it may be worth switching back to ethernet but using a 100mbps switch in-between your router and the Devialet. I cannot guarantee this will work, but we have had a few users report success.
-John