Nextbox works, but everything is wrong

Hello,
I have no idea, how to troubleshoot this, but it happened again, right after last automatic update, there is something wrong with the nextbox …

  • the led on NB is dimmed-out-blue: NextBox is booting, but NextBox is loaded
  • reboot does not work, hard boot restores the same state
  • access to NextBox: NextBox System Daemon Status is stalled at testing, the icon indicates constant loading
  • I lost Remote Access - Not Configured, I’m getting errors from Let’s encrypt, that my certificate is not updated
  • I get errors like file_get_contents: Failed to open stream: Connection refused at /var/www/html/custom_apps/nextbox/lib/Controller/PageController.php#38, Exception HMAC does not match: Could not decrypt or decode encrypted session data in InvalidTokenException Token does not exist: token does not exist
  • some apps are not working at all, reinstalling does not help

Basically, I have no idea, how to restore the previous state. If I start from the same image, I’ll get the updates and with them this state. Is it possible to somehow prevent automatic updates?

Thank you for your help
Matej