Thank you all very, very much. I can confirm, that there was a change. I’m not absolutely shure, but I think I didn’t manage to downgrade Google Play Services really in time. So I assume, a simple “waitimg for the magic to begin” can solve this issue either.
I left my (unchanged and effected) phone powered on in a wifi connected state, 1h after your post everything seem to work normal, no reboots or anything.
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