Random reboots After android 13 update

My phone had the Android 13 update. It has been ‘pushing’ me to install the upgrade, and then said “if you don’t update, in X weeks the update will install”
Which looks weird.

But today the phone runs on FP4.TP1X.C.079.20231013

And yes, sudden reboots have been noticed.
Not often, until today. More specific: this evening.
7 or 8 reboots between 22:20 an 23:30 local time.
Well, in the train it connected to 5G data connection. The problem seems to have stopped with home wifi.
Hope the normal 4g will be available tomorrow. Brussels doesn’t have full 5g covering, Flanders pretends the 5g is almost everywhere. But if 5g resets my phone, I want to limit the connection to 4g.
Not sure whether that is possible, though.