Anyone else have a problem with their screen freezing? It's doesn't seem to be related to updates - totally random thing. Today I've had no issues, but two days ago I couldn't even answer a call because the phone began ringing (I was using the browser at the time) and screen went blank. I could hear the phone ringing but nothing on the screen. I finally restarted it and was able to call back fairly quickly, but very frustrating since similar issues happen a couple of times a week. Is this a quirk of a smartphone? Or Droid? Or Revolution? Or is it in need of a fix?