This morning when I wanted to charge my Pandora up, the charging light did not come on when inserting the barrel jack. I reinserted it a couple of times but it didn't help so I rebooted the machine. After it rebooted I inserted the charger and the red light came on for a brief moment and switched back off again. I tried re-inserting it a couple of times again and just when I was about to give up the charging light began to blink. It switched off again and a couple seconds later it started blinking again and then it kept on charging. I took the charger out, re-inserted it and it started charging straight away like nothing was ever wrong. My battery was at 45% the whole time. Does any one have an idea what could have been wrong here?