I have been facing these unexpected shutdown in my iphone 14 plus which is up to date with the ios 17.6.1 update.

FreeMan_46 wrote:

Iam looking for a solution for this issue. It is not even a year since bought this device.

Follow the 3R 's- if a restart does not solve your problem proceed 1,2,3

Have you shutdown & restarted the iPhone ie power off/on...

Restart your iPhone - Apple Support

Reset or a Force Restart,

Force restart iPhone - Apple Support

Restore from backup, restore as new device.

Restore your iPhone, iPad, or iPod to factory settings - Apple Support

Put your iPhone in diagnostics mode - identify potential hardware and software issues

How to put your iPhone in diagnostics mode - Apple Support

iPhone Repair and Service - Apple Support

iPhone Repair & Service - Apple Support

Apple Authorized Service Providers and Independent Repair Providers

Repair Provider Verification - Official Apple Support

Check Device Coverage

Check Your Service and Support Coverage - Apple Support