Canvas window - video plays back at different speeds from the timeline. Why

I've scanned 25 pages of topics but found nothing that mentioned this as a problem. When I play a sequence in the timeline, the video in the Canvas window slows down (and sometimes suddenly speeds up to catch up with the audio) About the audio, it sounds find regardless of how the video is playing back. if I hit the space bar to stop play back, the video snaps to the correct position.
Any ideas why?
Sometthings I've noticed : If I restart my computer, the video tends to play back fine. But if I leave the program open and use it alot, the play back problem happens over time. If I make the canvas window tiny (25% size), the video plays fine but at 50% - I get video speed changes. (audio, always good)
Here is what Im using : The project is about 20 mins long. I have over 50 gigs of HD space (the Macs main drive) Im using FCP version 4.5 on a Dual G5. 2.5 GB of Ram.
Well thanks to any one who respones.

When I play a sequence in the timeline, the video in the Canvas window slows down (and sometimes suddenly speeds up to catch up with the audio) About the audio, it sounds find regardless of how the video is playing back. if I hit the space bar to stop play back, the video snaps to the correct position.
Does this happen in any other sequences within this FCP project? Or, for that matter, with any other projects on your FCP system?
And, to confirm, your media is running off your system drive? That is, your machine has only one hard drive on it, correct? (Partitioned or not)

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