Thank you for all the replies.
The problem does indeed lie with the speed of the disk.
When I reduced the video quality, there was no problem recording for several minutes.
No I just need to get a faster disk.
Cheers
Victordinky

I have a Pentax K7 with a 32 GB SanDisk.
Every time I shoot in Movie mode, recording stops after 35 - 38 seconds.
The disk has been formatted. Any suggestions?

Cheers
Victordinky
Toronto, Canada