I have a collection of movie files mainly mkv and avi. I will be watching a movie/tv file when at random times, a segment lasting 2-3 seconds of a COMPLETELY different movie/tv file will start playing. The 2-3 seconds of the original file are replaced with this segment. I can reproduce this with the same file if I rewind and play again. This is an annoyance more than anything(volume differences scare the crap outta me. I'm hoping someone can at least help me figure out what might be causing this problem. Faulty hard drives? Defragging issues(I use defraggler)? Have you ever heard of this happening?