MinimServer 2.2 update 245 vs DSM 7.2.1-69057 Update 3 issues

[MiniMe]

I've due to UPnP suggestion above reset my router 1,5 day ago and redid all settings again to fix a starting point.
For 1.5 day ran successfully multiple simple mixed tests with playing/browsing on computer, phone, player with Synology Media server and MinimServer side by side but could not get MinimServer to crash. Later for a couple of hours tried listening with iPhone over the network with upnp music player. Interesting point: Directly after the router/diskstation reset it was possible to move the playhead in each song in the playlist directly after song start to wherever in the song and the player picked up unexpectedly fast and snappy. However, after a few hours of scrolling songs, skipping songs back & forth, then moving playhead in each song to the middle for a row for say 50 songs, I noticed the player seemed to crash, as it would not pick up anymore when moving the playhead, or simply it got impossible to move it, looks like a buffer got filled. Then finally music did not want to play. Moved to Synology Media Server and playback from there would work perfect. On the iPhone MinimServer was still visible in the server list, but when browsing into the library got a spinning wheel.

Thus started computer, opened MinimWatch. White icon, looked ok. Opened Linn Kazoo app, first sight looked ok, but then I noticed when browsing back in the MinimServer library that album art was gone (stored as separate images in music folder), then when moving to top level (select server level) reselected MinimServer, then when opening MinimServer music library got a spinning wheel that would not disappear. Then again to top level, and MinimServer was gone from the server list.
MinimWatch then still gave a white icon. I put on Debug Logging level, but that didn't give any hints. I tried doing a rescan. MinimWatch icon would not go yellow like normal. It seemed to fail. It took a minute or so (no updates in the log window) then got a popup from MinimWatch Error: "Error from server MinimServer[DiskStation]: see MinimWatch log for details".

This is what is in the log:
00:30:49.654 AWT-EventQueue-0: TrayView: rescan action
00:31:49.665 Thread-28: Error 1 [Unknown] invoking GetAllPackageStatus on remote runtime monitor
Error 1 [Unknown] invoking GetAllPackageStatus on remote runtime monitor
00:38:52.479 Thread-28: refreshing monitor status
00:38:52.480 Thread-5: MonitorRefreshStatusAction starting
00:38:52.538 Thread-28: ServerControl: restartServer action (with rescan)

MinimWatch icon - upon its error message - went grey.
MinimServer via IP address says happily: "Media server status for MinimServer[DiskStation]: Running". (but that was no longer true)

Router reboot: no change
Diskstation reboot: MinimServer up and running again. MinimWatch white icon, MinimServer library correctly showing in Linn Kazoo also correctly showing in iPhone app.

So, a best guess how to replicate. Just use multiple players for 2 days and add a couple of hours "active" playback where in each song you skip some minutes by moving the playhead back/forth in multiple (my case 50-70) songs while they play.