it is normal that my phone restarts approximately every 5 minutes
restarting ipjone on ios 18
Depends what you're doing at the time on a beta version of an OS.
Raise a Feedback report, and post the FB number here.
I get the exact same issue with my own iphone 12, heating issues too, thought heating issues causing the restarts but put my phone next to a fan to cool it down and it still randomly restarts, and its only just started a couple of hours ago!