On location in the Himalayas and a bit of a nightmare has occured. I am on my fourth day of shooting a documentary with my 5d mark iii and am finding that any clips over 3 minutes long are showing some major corrupt glitching. The clip will play fine in camera off the same cf card, then once I have it pulled up on the computer through either usb, it starts to show strange color bars and greys while still playing back clean audio. Today is my first day really noticing this which is a heartbreak as there is a lot of amazing footage still glitching from days back. I know at the very least it is nothing to do with the cards, as this is happening with all of them. Any ideas??