Iphone 14 Turns off then turns back on after an hour or two, it happens three 3-4 times

Try a Forced Restart on the phone. Follow the instructions very carefully, as this is a bit tricky. (Hint.....ignore the "slider" when it appears and keep holding the Side button in until the Apple logo appears. This might take another 30 seconds.)

Force restart iPhone - Apple Support

There are only 2 possible results when you perform a Forced Restart:

1) The phone returns to normal operation

Or, if the phone continues to shut down.....

2) There is a hardware problem with the phone that will need attention at the Apple Store (make an appointment) or take the phone to an authorized Apple Service shop.

You can find a list of authorized service shops in your area using the link just below:

Find Locations

RaineXoxo Said:

“Iphone 14 Turns off then turns back on after an hour or two, it happens three 3-4 times: My iPhone 14 pro is turning off randomly, it happens when I downloaded a pdf file, it's almost a month now that this problem has persisted. My iPhone 14 pro is updated.”

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Troubleshooting a Restarting iPhone:

Perhaps you installed an update, intermittently, or not. As a result, the iPhone is likely stuck in a boot loop. This us usually occurs when you go about installing an update, and it stalls while in the process.  So, refer to my user tip: How to Fix an iPhone in a Boot Loop - User Tip