Hi guys, I have just starting having trouble with my X8. It keeps rebooting itself and has very bad battery life whenever i use any kind of app e.g. navigator / maps, although it has started doing it sitting idle. The phone was upgraded (2.1) some time ago. This problem started after a decent car trip a few days ago where i used the navigator, on and off the car charger. I have just realised if i remove the sim and start the phone, the problem is gone and the battery is more stable. I have always used juice defender app and the battery easily lasted the day through. I originally blamed the battery, but now im thinking it has something to do with the sim (australian amaysim prepaid (optus network)). I tried an optus sim and it has the same problem. i have also found that if i have the phone connected to the charger, the phone works fine with the sim card in. Any info on whether its a network, or a phone problem would be greatly appreciated. Cheers, Craig.