Wirelessly posted (8700g: BlackBerry8700/4.2.1 Profile/MIDP-2.0 Configuration/CLDC-1.1 VendorID/100)
That's my only idea: Experiment. See if there is any pattern based on what is left running when you power off. It's a total SWAG, of course...May be something totally different. But experimentation will at least rule out this possibility.