BLACKBERRY 9830 TOUCH O2 .

I HAVE A BLACKBERRY 9830 TOUCH I AM SELLING THERE IS A PROBLEM WITH IT: IT TURNS OFF LIKE EVERY HOUR AND HALF AND THEN TURNS BACK ON. OTHER THAN THAT THE PHONE IS GOOD HAS A COUPLE OFF SCRATCHES ON THE BACK AND A CHIP UP THE FRONT OF THE PHONE BUT IN GOOD CONDITION THE PHONE IS ON O2 NETWORK