Weird video freeze / Preview Blacking out?

Hi everyone I am just wondering if any of you ever got lockups from videos? Sometimes if i just highlight a video clip (browsing in column view) and my MBP would just freeze up while generating the prview on the right side! Like complete freeze and it happened few times already really annoying. What could be the cause of this could it be video card?
Also I read comics in Preview in slideshow mode (full screen) and sometimes after a while when changing from 1 pic to the next the screen would stay black and i get the "beach ball" =P I can't do anything to get out of it even though I could still hit the POWER button and select SHUTDOWN but nothing happens after that and then I can't bring up the SHUTDOWN menu any more...could this b video card issue as well?? This is kinda like freezing but not really...had to force power off =(

it's not solved but haven't appeared recently

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