Endless syncing on Linux 3.15.2 and 3.15.3, 3.14.3 was fine

Hi,

I use the Nextcloud AppImage on a current LMDE installation.

Connected are 2 clouds:
a) my private self hosted nextcloud
b) German T-Online provided MagentaCloud (based on NextCloud)

Sync ran well for a longer period of time.

Recently I updated the client from 3.14.3 to 3.15.2.
Initial sync ran fine, but after a few seconds the sync to to MagentaCloud starts again. Finishes, and starts over - infinite.

So I went back to 3.14.3 and all was ok again.

When 3.15.3 was released I tried again, but same issue.
Endless ever restarting sync.

So I am back to 3.14.3 for now.

Ideas?