Random speedups & no audio when viewing video?

I've been having this odd occurence with my i5 macbook air 2013 on Mavericks. Sometimes, when I am viewing a video, the video would randomly speed up for a second, then resume to normal speed with no sound. After several seconds, the sound would return, resuming to normal playback. This has happened on Youtube, other streaming websites, and a media player app, MPlayerX, so this isn't app specific. This occurence happens rarely, and seems to happen at random times. Has anyone had this problem? Any solutions?

Thank you so much! Looks like it did the trick. I downloaded this last night but wasn't aware of how to use it and found step by step instructions and worked very well. Thank you again!

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//help will save the world

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Random speedups & no audio when viewing video?

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