Don’t reset anything!
As I wrote above my theory is, that there’s a problem with sequences however:
There’s nothing about sequences there. So please hang tight, I’ll come up with the next thing to test.
@Moisie We know there’s something screwy: Crash or hard shutdown can case database inconsistency, out of sync · Issue #6335 · syncthing/syncthing · GitHub and Syncing issues, database missing sequence entries · Issue #6304 · syncthing/syncthing · GitHub and Jakob recently discovered why, so there’s something fixes in 1.4.0 (maybe there’s still more screwyness, but until proven otherwise I assume not 
).
Regarding permissions: That’s definitely not the issue here. Permission errors would result in out-of-sync/failed items on the folder. This is just about remote devices.
Thanks for the heads up, I’ll have a look what’s going on there.