Thing page in openhab UI not loading

Hello everyone,

sometimes I have the issue that the things page in OH3 UI is not loading.
All things are working fine and I can access all other pages like items, rules, etc. So only this page is not loading. Mostly when I check a day later it,s working.

It looks like this:

The blocks without text are flashing coninusly like a loading bar but even after minutes nothing is loaded. Inbox button and button to add new things are working fine too.

Any idea what could be the cause of this?