I recently got a new video camera (Toshiba Camileo H30). The extremely frustrating issue I'm having is that some of the videos I shoot look beautiful and crystal clear when I view them on my computer, and others look like a grainy mess. I can't see a common theme to the grainy photos. I'm keeping all the camera settings the same, and using the same programs to view the videos. I don't think the lighting is the issue, because some videos with lots of light are grainy, and some are fine. The only somewhat consistent theme is that the long videos (20+ minutes) are pretty much all grainier than the shorter videos. I am using a Transcend class 6 SD card and shooting in 1080p. Could the SD card be the issue?
Thanks very much in advance to anyone who can offer me any help/advice!

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