Issues with apps freezing - anyone facing similar behaviours?

I am facing a strange issue: Since about 2 weeks apps are freezing.
This happened to me on the standard phone app as well on my camera app (I am using a GCam modded version). With both apps it was possible to close them and restart them, then thew showed the correct behaviour again.

For the moment I do not posses log files as the issue is just appearing sporadically and I wans’t able to reproduce it yet. I only have screenshots to provide (see below).

I was wondering if - by any chance - any of you is facing a similar behaviour. In this case please give me notice.

My device: Santoni, official /e/ Oreo (latest)