I've had my DHD for about 6 months now and I've recently started getting some problems, I would look at my phone and it would be fine one minute then when i look again it says my Sim card has not been detected and gives me an option to restart or shut down. It either comes back on and works perfectly or i have to keep taking out my SIM and reinserting it until it works (yesterday it took around 2 hours). I really can't live without my phone for two hours haha, another problem i've been having is that my phone has forgot my Google password as well as myself. Is there a way to change what my phones default Google account is so i can access the market again without deleting everything?