Client: No connection to server - until I remove and readd the account

After reboot or suspend Nextcloud client 2.3.3 cannot connect to server 13.0.5 anymore. Logging out and back in in the client does not seem to help. What does help is removing the account, then adding it again. Synching then continues as normal. This is reproducible and I have no idea how to debug this since no log is written (or is there?). The sync log is only updated after the synching has begun. Any ideas?

I can confirm this with client version 2.3.3 and running on Gnome 3.29

Lubuntu 20.04

Desktop client: “no connection to nextcloud”. The same issue on 2 computers.

Log out/ log in and system reboot does not help.