I purchased a 32 GB AT&T iPad 3 on Friday. I activated my data plan and everything was working for a few minutes. All of a sudden the "4G" next to AT&T disappeared and the data stopped working. The only thing showing in the left section of the top bar was 3 or 4 bars and AT&T. In order to get data service back I had to either restart the iPad or turn the celluar data off and then back on. On Sunday I took the iPad to the Apple store and they replaced it saying it may be defective. I reactivated the new iPad when I got home and I immediately had the same problem. After it happening again I doubt it was an isolated problem. Is anyone else experiencing this?? It is super frustrating. I'm almost ready to return the iPad all together. My iPad is NOT jailbroken or modified in anyway. The only thing I have done is setup my Exchange email account, Keynote, iMovie, Facebook, Pandora, CNN and Speed Test. If anyone has a solution I would be thankful.