SX40 video problem

I tried shooting video in my SX40 HS today, and showing it in a QuickTime player on my desktop computer. The results were not good. Here’s what happened:

1. I open QuickTime and then open the .MOV file in it
2. A still frame of the beginning appears on screen.
3. I click the play button
4. As the frame remains frozen, I get two seconds of audio, six seconds of no audio  . . .  two seconds of audio, six seconds of no audio  . . .  and on and on.
5. Meanwhile, the time track marker jumps two seconds when the audio comes on and six seconds after the quiet periods, until the marker gets to the end of the time track. Then the frozen video on screen jumps to the last frame taken (also frozen) before going back to the frozen image of the first frame.

Any ideas as to what the system or I am doing wrong? Thank you!