My genuine Canon BG-E6 grip started acting up. The 3 buttons work no problem, however the wheel doesnt work at all and the shutter release button will not take pictures. It will intermittently focus when depressed but will not trigger the shutter. It also intermittently "cannont communicate with battery" with 2 genuine canon batteries in it. The 5D2 itself works no problem but the grip itself is acting up. Anyone have/had similar problems that can help out?