My 3G keeps un-activating itself randomly. I am on the latest baseband 4.20.01, but I know it has nothing to do with updating to 3.0 and downgrading back to 2.2.1 since it has been doing this all week. (I only updated the day before yesterday, and I know it did it before.) I have restored twice since this started (once to upgrade to 3.0 and again to downgrade.) Any suggestions to fix it? Could the sim card be doing it?