iPad charge dropping to 0 suddenly
Hi,
My iPad is a bit over a year old. Until very recently, it was working great - 10-11 hours battery life.
In the past week, it suddenly started dropping from being 80-90% charged to 0, overnight (being idle). I just pick it up, and it won't start - showing me a blinking red bar in a battery and an icon for charging. I connect it to the charger, it takes 20 minutes to agree to start and then shows 0% battery, and takes the usual time charging to 100%. Then I use it, as normal, say until it's at 80%. I turn it off. Then the next morning, the same story repeats.
Is this a known problem? Battery/hardware, or software? What can I do?
iPad, iOS 4.3.1