It happened again last night. My data allowance was completely drained by 02:00 am. Diagnostics and Data show a crash at 02:24 am. So far so good this morning, but I keep watching. I got a data refill and do not want to lose that too. This is ridiculous. As the data was draining I watched Settings-General-Usage and it gained about a half a gig then went back down. Using my iPad has become awful.