Has anyone had an issue shooting video with the power supply attached? I just had a huge shoot today and was hooked up to power. My camera stopped working in live mode and wouldn't record video. I took out the power supply and put it back in, and then it worked again for about 5 minutes and then the same thing happened. I went to battery power the rest of the day and the shoot went fine from there. I don't know if this is an issue with my particular ACK E6 or if there are any documented issues with this and the 5d mark iii. Thanks!