iphone 12 shutting off on its own

Does it stop if you do a forced restart? First take off any case. Then:

Press and very quickly release the volume up button. > Immediately press and very quickly release by the volume down button > Immediately press and hold down the side button and keep holding the side button until the Apple logo appears, release the side button. If your iPhone won't turn on or is frozen - Apple Support

When you go to Battery Health in Settings what does it say? Maximum Capacity % and does it say peak performance, or a different message?

Boymomma13 Said:

“iphone 12 shutting off on its own: my iphone 12 is turning off and resetting itself about approx every three minutes. it has never been wet and i have alreasdy had the battery checked out”

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Getting Out of a Boot Loop:

Your iPhone is stuck in a boot loop. This typically happens when an update stalls.  So, refer to my User Tip: How to Fix an iPhone in a Boot Loop - User Tip

prettygirlmisty Said:

“I’m having the same problem”

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See my above reply.

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I’m having the same problem