Mobile agent

I’ve noticed that from time to time my SMS and my Call Logs and sometimes my old e-mails get deleted at the same time for no apparent reason. But it’s been doing it all day since yesterday. It doesn’t even let me receive messages… they get deleted instantly. I don’t know if it’s happening because the device memory is full. Just in case I’ve already transferred everything to the memory card to see if this resolves the problem. Has this happened to anyone? Do any of you know why it’s happening?

i woke up this morning and all of my texts and recent phone calls were deleted. then just now i go back and everything i have done today is gone as well. i called tmobile, and they said this was a known problem. but that was all. so does anyone else know what the crap is goin on and can help me? thanks