Sometimes no interface

Hello,

sometimes i get the problem, that when i open the Avast-windows i get the window with no content.

https://imgur.com/Yht7SIc

Last time i reinstalled avast and the problem was solved, but now i get it again.

What can i do?

What can i do?
https://support.avast.com/en-ww/article/Repair-Antivirus