@Lady-Leon This has nothing to do with Covid 19.
admin and support are not in over weekends and holidays, only peer support.
The server stability has been a longtime problem on Catan Universe for the last 3 years. You will find hundreds of posts on this matter. Developers are aware of it and working on a longtime solution. But to untangle the spaghetti code that probably caused this will take some time.
For a short-term fix you can try the following:
empty browser chache and close other apps, or
logout/ login or
deinstall/ reinstall the game
If these suggestions don´t help, write an email directly to support.
They will respond on monday. Good luck!