anybody else having problems with their chargers? two days ago my original one went out. when i plugged it in there would be a dim green light on but it wouldn't charge my laptop. went to apple store to get it swapped. this is my second one and it just stopped working. i kept it plugged in while using my mba and it said 100% charged. i restarted and the computer and now it says only 37% charged. the charger light won't turn on or anything just wondering if anyone else is experiencing problems with this also. i know its just a simple swap but its getting kinda annoying.