OH3: UserInterface is black

Hello everybody,
I sometimes have the problem, that the UI of openhab3 is just black and there is no object loaded. Then just a restart helps and I don’t know why this happens. All rules and so one are still working, just the UI is affected. Also the logging on port 9001 is still working.

I am using OH3 openHAB 3.2.0
running in a proxmox container.

Checkout this, maybe same issue

Main UI regularly crashes after a couple of days, browser stays blank