I have a problem similar to what was described by the original poster.
I have an Antipodes DX with a 1 TB disk holding part of my music. I have a Gbit connection to a QNAP NAS which holds the remainder of my collection
Until the last upgrade the past week, there was no problem with disconnection/dropout/lost connection to the core - to be precise, maybe two in the past 16 months.
The NAS is attached as an external Folder through the Add Folder. It is connected with \servername\music\ and has worked fine for two years. I detest the fact that Roon requires a complete import and goes through all that rigmarole to not import anything but it did not stop me listening to music so I could put up with it.
Diagnostics on the Antipodes show no issues there. Roon Ready version is 1.1.20 Roon version 1.3 build 274.
Test 1. Roon took over 2 minutes to show anything more than the jiggly Roon logo. It used to be seconds until the update
Test 2. The phone app spent a minute showing a loading screen for the previously played album then lost connection. Same behaviour as the PC version. Both the PC and the phone version of the program then reverted tot he jiggly Roon icon and showed (simultaneously) the previous screen used on the respective program/app. Disconnection after about a minute. Reconnected 40 seconds later. Checking the scanning/adding about 480 tracks showing as being imported. Disconnected again and jiggly icon … repeated this pattern for over an hour while I watched the screens. All or most times it reconnected, the scan restarted from scratch.
I see a large workload on the Antipodes while importing the files. It imports 50k files and then proceeds to analyse them and add none to the Roon database because there are only occasional changes when I buy more music. I have not loaded new music in the past week. During the time it takes to analyse and (not) import all these files, I cannot play music without a dropout; requiring a wait until the Roon program (PC or iPad are the same). This wait can be 3 seconds or as long as 20 minutes. If I can access the Roon interface, it is usually only for a few seconds to a minute at a time.
I have watched the importing process and have seen the number of files being “imported” reduce to a hundred or less only for the rescan to kick in and the whole thing starts again. Access to Roon to change options for importing is not possible during disconnections and any disconnection cancels what ever I was doing on top! This means the interface stops me from being able to correct whatever issues might be improved by changing settings (some of which may have altered in the update). Each time it imports and scans, there seem to be different numbers of files, clustering around two numbers about 500 apart.
Essentially this means I cannot any longer listen to music. Nothing else has changed except the Roon update. Nothing was wrong before the Roon update. The problem observed happened immediately after the update and has continued since.
My additional testing was to:
Disable the connection to the NAS (Storage-folders) and there fore stop the scanning and fake adding etc.
Now I can listen to the music on the local disk in the Antipodes but not to the larger collection on the NAS.
This is probably diagnostic of the problem residing around the scanning-adding etc when doing the initial scan of the NAS connected drive.
As far as I am concerned Roon has taken over a $20k worth of my equipment and prevents me from listening to my music.