Cloud synchronisation fail, error 500

Yesterday evening, i had several issues with synchronization.
/e/ servers returned ‘error 500’

This morning, no error anymore, but nextcloud client doesn’t detect folder differences, despite remotely i have 50 files and locally 40

I tried to fully delete my local folder, drop and recreate my local conf but it syncs till 40 files again.

It’s because wasn’t reachable for a short amount of time.