Video stalling but Audio OK

I'm experiencing problems with the Video ramdomly "stalling" or just showing a single frame when playing back videos. The Audio keeps playing but the video "freeze" can happen for a few seconds. It normally just carries on after the glitch. This is happening on 90% of my content.
Also, I do notice a bit of vibration occassionaly when the disk is accessed but this does not appear to be related to the video stalling.
Any suggestions or observations?
Thanks

I'm experiencing problems with the Video ramdomly "stalling" or just showing a single frame when playing back videos. The Audio keeps playing but the video "freeze" can happen for a few seconds
Are these movies you converted yourself? If so, were you possibly "pressing the envelop" when it comes data rates and/or settings which tend to "choke" the iPod during decoding/processing of data (e.g., increased pixel dimensions, audio sampling rate, etc.)?

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