How to solve?
It happens to me when I use a game or YouTube for a long time that after a while that application turns itself off
iPhone 11, iOS 15
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Top-ranking reply
Try a forced restart.
• Press and quickly release the volume up button
• Press and quickly release the volume down button
• Press and hold the side button.
• When the Apple logo appears, release the button.
https://support.apple.com/en-in/guide/iphone/iph8903c3ee6/ios