Make an appoitment with Apple to have it checked out https://www.apple.com/uk/retail/geniusbar/
Fixed the subject line.
Maybe this is artially due to the problem affecting many O2 XR customers at the moment. Apple will run diagnostics on the phone if you can get yourself to a store and you will walk out with a replacement phone if t proves to be faulty.
Store finder : https://www.apple.com/uk/retail/
Any update on this one @LordB? Did you find out what was happening with your iPhone?
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