Something has gone wrong with the battery/power unit in my 3GS. Mainly I think the battery or whatever isn't correctly reporting how much power it actually has. It can be at 50% and all of a sudden turn itself off. If I try to turn it back on it gives me the "plug me in" screen. 2 minutes later it will turn right back on and show 50%. Another thing it's done a few times is drop suddenly to a really low number on the battery meter and stay there for hours. Obviously I know the battery meter isn't perfect but when it makes it turn itself off it becomes a problem. Anybody else seen this?