iPhone suddenly starts asking for MobileMe password
Just in the last few days, every time I waken my iPhone 4 from idle it asks me for my MobileMe password. This means I now have to enter two passwords to use the phone - the device's own unlock numbers and then the Apple password. Infuriating. Any solutions suggestions appreciated.
Dual quad core Mac Pro, 2.16GHz MacBook Pro, 16GB iPhone 4, 1.6GHz MacBook Air, Mac OS X (10.6.5), 16GB iPad