Sony Ericsson Z750

I had the same problem with this phone. Out of the box the first one did not recognize picture and ringtone ID's. When I called the AT&T store I was told to bring it back and get a new one. The AT&T sales person tested the new phone to make sure that it worked, but sure enough, when I got it home, it stopped working. The phone was fixed when I went to the Master Reset under the general tab on the settings, and selecting "reset settings".

This phone concerns me because earlier today the phone just died. It wasn't off, just frozen and it would not work at all or turn off. I had to take the battery out and when I started it again, the date and time would not adjust correctly. I did the whole "reset settings" again but the time was still wrong. Then about 5 minutes later the phone died again. This time I took the battery and SIM card out and then it seemed to work. I've only had this phone for 5 days and it's giving me trouble. I wonder if I should just take it back....