This may be my camera, but I've one reason to believe it may be ML and interesting to you.
After running ML 1.1.3 and shooting video a lot for a few weeks, I experienced an Err 20 (mechanical issue), and an accompanying audible mechanical noise. I played around a bit with lenses / SD cards. I noticed in the ML menu that ML appeared to have reset itself - functions were all turned off. I thought nothing of it. Later, the camera started working again, possibly with a different SD card. Forums suggest this may happen with Err 20, unrelated to the card. What is interesting is that ML had gone back to my previous settings, eg FPS override was on, after being off earlier. In case useful. Debug report attached.
Keep up the great work.