How can I fix the sudden restart/turn off issue on my iPhone 17 Pro?

"I phone 17 pro sudden restart/turnoff: I purchased I phone 17 pro( Deeb blue/256 GB) nearly 3 weeks back. Since day 2 it was facing sudden reboot issue. After 3 days i updated the IOS to 26.0.1. Then the issue stops for nearly a week. Now again it has been started and almost every other day sudden restart/ turn off occurs. How to resolve this?"

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Being Stuck in a Boot Loop:

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

“How can I fix the sudden restart/turn off issue on my iPhone 17 Pro?: it auto-restarts in every 3/4 days mostly when I am not using it. Any solution/update ?”

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Thanks for the followup reply.

Rebooting in a Continuation of Time:

Well if it is not persistent, then, it’s either a bug, or a power issue.

Update Using a Computer:

Were you able to update to iOS26.1? If so, does this still occur? If not, you can try installing an update using a computer:

1. Back Up First:

IMPORTANT: If you have an option to update, however, then be certain you backup your iPhone first. That way, you will have something to restore your iPhone from should anything go wrong with the update.

then...

2. Proceed with the Update:

Go Here:  Update your iPhone Using a Computer - User Tip

anirban81 wrote:

it auto-restarts in every 3/4 days mostly when I am not using it. Any solution/update ?

If TheLittles bootloop tip does not solve, then start a support/repair session with Apple https://support.apple.com

Hello how can I help you

"Hello how can I help you"

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Well, you could help by providing troubleshooting. Any ideas on your end?