My iPhone 11 keeps restarting by it's own even after updating it
My iPhone 11 keeps restarting by it own even after updating it.
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you may have a hardware problem
First try a forced restart
https://support.apple.com/en-gb/guide/iphone/iph8903c3ee6/ios
If that does not help the next procedure would be to backup then restore your device to factory, and setup the device without restoring a backup, to see if the issue is replicated.
Then restore the backup.
Here is a guide for those steps:
Backup and restore
(1) How to back up your iPhone, iPad, and iPod touch – Apple Support
(2) Restore your iPhone, iPad, or iPod to factory settings – Apple Support
(3) Restore your iPhone, iPad, or iPod touch from a backup
If that fails arrange a repair