Bought the machine a while ago and didn't use it. Tried it out recently and it worked fine. Then I unplugged it for 1-2 days and now there are problems. When I plug it in, the blue charging light flashes for a few seconds then there is ONE BRIEF BEEP, the bule light stops blinking, and the red low battery light REMAINS ON. This happens even when I plug the ac adaptor directly into the machine, not via the docking station.