Replying to Contour Roam2 corrupted files

I have a Contour Roam2. Occasionally when I have it running for a few minutes, the video file is corrupted and I can only watch the first part of it. It makes no indication when this happens, it acts like it's still recording, and I don't find out until I get home and play back the files. It tells me the full length of the file, but can only play part way through. Has anyone else had this issue? Any ideas how to fix it?