Joplin with Syncthing eventually won't sync changes

HI

Joplin using Syncthing is absolutely amazing! The problem is, at least once on my MacBook Pro out of a few weeks on Syncthing (I have a Windows desktop & Windows laptop & Android Phone on syncthing), it will ‘sync successfully’ but won’t actually sync the changes. What I have to do to get it to sync the changes is to delete the config files and set the whole thing up to the Syncthing DIR.

Anyone know what is going wrong here?

Joplin for Mac OS X
Joplin for Desktop

Copyright © 2016-2020 Laurent Cozic

Joplin 1.0.193 (prod, darwin)

Client ID: c47637a4c8b24950ab16933b80b9ec4d

Sync Version: 1

Profile Version: 28

Revision: 58e2d7b (master)

Thanks!