I'm not sure, but perhaps since 3.1 my phone almost daily tuns off (even with full battery) and won't come on unless I hold down the two buttons for a resart. Which means I miss calls and texts when it's off. I can't pinpoint any specific trigger that causes the blackouts. When I turn the phone back on, the phone is fine for the rest of the day and the battery power is normal. Anyone else getting this?