UPDATE.......today i got a call from CANON, it seems that everyone is wrong in theri post about this problem, Canon will answer any calls to them, but will not admit anything a rep said. HERE IS THE PROBLEM WITH THE VIDEO AUTOMATICALLY STOPPING:REP S...
I took my 70D back to the dealer, and they seemed to know something???, they looked at the camera and checked the serial # and DID NOT LOOK at the sd card, they simply gave me a new camera body. i've dealt with this camera store for more than 30 year...