I have been on the phone all day with AT&T and they can't help. My Curve 8300 will not turn off. the backlight is set to turn off at 10 sec and it still won't turn off. I hit the Mute button, it goes black like it is suppose to, then within 3 seconds the phone pops back on. They want me to do a master reboot (is that what you call it?) and I will lose all my info, pics, etc. They said if THAT doesn't work, I have to send it back. Has anyone else had this problem b4? Can you give me any suggestions? thank you in advance!