Hi, I can't seem to copy files to the sdcard inserted into the phone. When I try to do this with Windows Explorer, it just hangs there, and the sdcard area of the phone gets really hot. Once I unplug the USB cable Windows Explorer resumes, but the phone is still stuck there and unresponsive to any button/touch screen presses, and the phone remains hot. Copying from the sdcard works. Does anyone else have this problem?