Canon 50 D problem

When working in AI Servo and continous high speed, my camera will cut off when holding down the hammer( 6.3 fps) after only a few frames( maybe 8-10). I have a 100-400 zoom and a 300mm f4 lens, IS turned on and IS in mode #2. All electical contact is lost. I can remove the batteries and replace them and it will come back on until same thing happens again. This is my second 50D. Canon replaced the first one. Unfortunately, I have the problem with this camera too. Has anyone else had this problem? If so,please let me know how to fix it.
Larry Brown

Something you can do right now......shoot anything you can see right now and when it stops, set it down without doing anything to it....go drink a beer or drink of your chice and then see if the camera will work....

Bill