choppy footage- result of dirty heads?

PDX_DVX

Veteran
Hey, I went to upload some footage, and got it all in fine, no visible dropouts, and it seemed to play fine while uploading, but now when I lay it down on the timeline, some shots look fine, and some shots look choppy. I am positive that I didn't switch frame rates or anything, I shot 24pa the whole time with a 1/48 shutter. I am sort of concerned about this, and I am wondering if it could be due to dirty heads? I didn't get the red x warning, nor did I see any tell tale dropouts, but I was filming in a really dusty dirty environment. Aside from that, is it possible that it's a problem with my firewire card or something of that nature?
 
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