Hi! Did anyone of you experience the same problem? I had this problem in my iPhone 4 last two days ago. I searched for a solution but nothing found. I soft reset my phone, hard reset, reset all settings and finally restore the software. My iPhone is not jailbroken and never been jailbroken. I bought it just two months ago. The only solution I could think of is to send it to the service center - so I did. I just want to know if this could be software or hardware malfunction. Many thanks!