Data constantly in use?

[JaredC01]

So for the second day straight my phone battery has dropped to half in about 4 hours screen off in my pocket... After closing every program and turning off data sync, the 3G connection is still constantly in use. I downloaded a network traffic program to check usage, and to my surprise my phone had downloaded over 260MB while in my pocket. I restarted the phone and the problem seemed to be fixed, however it's started back up again, even after restarts.

I haven't installed any new programs or widgets in the last couple of days, so I don't know what could be going on unless it's some OTA update that I don't know about. Is anyone else having a similar issue?