Yeah, you're right, thanks @Wimvan !
So, I'm using Joplin on 3 devices :
- v7.2.7 on Android 11,
- v2.7.14 on Manjaro 21 - Xfce 4.16,
- v2.7.15 on Win10.
The problem appears on both Android and Linux but not on Windows, witch syncs without alarm.
The data is on a webdav server.
Any suggestion will be welcome !
Diego