I've had this issue happen a few times, so I disregarded it, but a few hours ago it happened 3 times in a row. Here is what happens: I'm in the middle of a phone call, and suddenly I hear a beep, and I look at the phone and the call was disconnected (I'm back on the 'Phone' screen). I then realize that the phone becomes unresponsive (the screen doesn't respond, same thing goes for the Home/Menu/Back/Search buttons). The only thing I can do is press the top 'Off/Lock' button to shut off the screen, then press it again, and everything goes back to normal. This happened 3 times within 5 minutes. Is anyone else experiencing this problem? If so, any advice/solutions? My phone is stock, no rooting or roms. I've downloaded a few apps from Android market and that's about it. My 30-day purchase window is up in about a week, so I'd like to get this resolved before then to avoid any headaches. Thanks in advance.