I had to reinstall my server and now I am focussing on errors I see in the syslog:

May  8 22:40:51 Unraid plugin-manager: executing inline script: /bin/bash '/tmp/inline1-dynamix.unraid.net.sh'
May  8 22:40:51 Unraid plugin-manager: creating: /boot/config/plugins/dynamix.my.servers/dynamix.unraid.net-4.33.0-x86_64-1.txz - downloading from URL https://stable.dl.unraid.net/unraid-api/dynamix.unraid.net-4.33.0-x86_64-1.txz
May  8 22:41:07 Unraid plugin-manager: checking: /boot/config/plugins/dynamix.my.servers/dynamix.unraid.net-4.33.0-x86_64-1.txz - SHA256
May  8 22:41:07 Unraid plugin-manager: executing inline script: /usr/bin/php '/tmp/inline3-dynamix.unraid.net.sh'
May  8 22:41:07 Unraid plugin-manager: executing inline script: /bin/bash '/tmp/inline5-dynamix.unraid.net.sh'
May  8 22:41:08 Unraid plugin-manager: executing inline script: /bin/bash '/tmp/inline6-dynamix.unraid.net.sh'
May  8 22:41:08 Unraid plugin-manager: executing inline script: /bin/bash '/tmp/inline8-dynamix.unraid.net.sh'
May  8 22:41:29 Unraid plugin-manager: executing inline script: /bin/bash '/tmp/inline9-dynamix.unraid.net.sh'
May  8 22:41:29 Unraid plugin-manager: executing inline script: /bin/bash '/tmp/inline10-dynamix.unraid.net.sh'
May  8 22:41:30 Unraid webGUI: error: /plugins/dynamix.my.servers/include/unraid-api.php - wrong csrf_token
May  8 22:41:32 Unraid flash_backup: flash backup disabled, exiting
May  8 22:41:41 Unraid plugin-manager: dynamix.unraid.net.plg installed		

Any idea what's causing this and how I can fix it?

Unraid 7.2.5

Edited May 8May 8 by jluerken

Reboot in safe mode and post the diagnostics.

I have been having the same issue for a few weeks now.