Hi Guys, Im not sure what is causing my iPhone to reboot on its own but recently it has done it a few times. The iPhone is a 3GS that ive had for around 2 years, it was plugged into my car stereo (Pioneer DVD headunit with iPod lead - made for iPhone/iPod - also charges phone) running the Navigon app. The app runs and the sat nav is ok then it all of a sudden just reboot's the phone. its not something that always happens, it just sometimes does. Now im not sure if its the iPhone having problems? The headunit and iPhone having issues? The iPhone overheating (gets very hot running navigon)? or the Navigon app crashing and causing a reboot? Does anyone else have any ideas? A reboot seems a little worrying as its a pretty severe crash for the phone rather than just restarting an app, the entire phone just reboots. Thanks for any info. Ad.