I have the same prob...started after software update about late 2012...if it doesn't start taking a charge...unplug at tablet...hold power button down at least 10 sec..while still keep[ng button held down..plug cord back into tab ..and Presto!!!! ...........lol sometimes i think all my cords ARE A BIT GOOFY. Then i turn all my electronics off and go outside for a couple hours..breathe fresh air and get some sunlight...then everything works great