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Such issues occurred unexpectedly each time that I don’t know if I had touched somewhere while I was still using my phone.
iPhone 6s
Might have accidentally hit the side button. Some cases may make that easier than it should be to do.
Your phone should not lock if you are actively using it. If you are just looking at it and not touching it the screen will dim a few seconds before it locks, and if you touch it that will reset the lock timer.
You can also set the delay before it locks in Settings/Display & Brightness/Auto-Lock. But note that if you have Low Power Mode enabled it will be fixed at 30 seconds.
iPhone13 automatically turned off the screen and locked
