Hello, I have been using an iPhone 4 for quite sometime now. I haven't had such a weird problem before though, yesterday, I inserted a FM Transmitter, just the normal way (a 3.5 mm pin into the iPhone's headphone socket) and the phone turned itself off. After trying for several minutes to switch it on, it finally did. But later that day, it did the same thing. And I had to hold down the Home button with the power key for about 10 secs, after which it booted. I've - iPhone 4 iOS 4.1 Baseband 01.59.00 (If at all it matters) Jailbroken (Lime Rain) Unlocked (UltraSnow) I did search around and also googled but couldn't find a reboot on insertion of 3.5 mm jack. That's why I decided to start a thread. Any ideas ? Thanks for your time.