If your micro-USB port is loose, and from your last post it sounds as though it might be, then I can see that being a problem. Otherwise, the battery issues in devices are often due to firmware. I lost track of how many cellular phones, PDAs, and other devices I've had that would show a full charge one minute and a depleted charge the next, or vice versa. The actual batteries were okay, but the firmware had trouble communicating accurately with the batteries. Personally I think you should call CS. I've had three Kindles and none of them exhibited the issues you are seeing. I've been very lucky and my K3 WiFi only has never frozen or had any problems since I got it about six weeks ago.