My iPhone 3Gs turns itself off!!

[Abdullah#IM]

I've got an iPhone 3Gs 32G, and after 5 months from buying it, it has started turning itself off, ESPECIALLY WHEN THE CALL TAKES MORE THAN 2 MINUTES!! By the way, my phone isn't jailbroken, and I HAVE NOT TRIED TO JAILBREAK IT!!!

So, does anybody have had this issue? what did you do to solve it?

 

[uhanrodric]

Try restoring it via iTunes. Couldn't hurt.

 

[big9erfan]

Restore as new, if that doesn't work take it to an Apple store.

 

[Abdullah#IM]

Thank you guys, I've just finished restoring the phone, seems okay now, but I'll be updating this thread if the issue starts again.