i have a iphone 11 and it keeps turning on and off im trying to rest it dont know how
my iphone is turning on and off by itself
iPhone 11, iOS 15
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First try a Forced restart
https://support.apple.com/guide/iphone/force-restart-iphone-iph8903c3ee6/ios
If no better
You should arrange a repair
https://support.apple.com/iphone/repair/service
Anything other than Screen or Battery may be a replacement phone and the price is in the article.
You can see additional service information within the following article:
Prepare your iPhone for packing and shipping