I just experienced the same issue. Card 1 set to RAW, Card 2 to Medium JPEG. Out of 570 files, 30 was captured as compressed JPEG (2432x1824). And 72dpi.
It cost me 150 euros. Canon official repair service in Athens.They said, that they replaced cable and reinforced it. Looks like, Canon service is aware of the issue. I wonder if newer models, have this issue fixed.
I have the same problem. Any aperture other than 2.8, gives error 01. Except at the wide end. As shown in this video https://youtu.be/v_9umlhqRao?t=27The idea, about camera bumping on the hip and lens being damaged , is interesting. Because I have JO...
