I had about an hour the other day in which my Captivate was displaying 5 bars with 3g connection, no abnormalities at all. Except it wouldn't send/receive text, data or calls AT ALL. I could access my voicemail, strangely. But nothing else. It kicked back on as I was heading to the AT&T store to ask about it, so I wrote it off as a one-time glitch initially. Then it happened again several hours later. I took my Captivate back and exchanged it for another one, because I absolutely love this phone when it's working. I was just wondering, has anyone else had this problem or heard of anything like it?