I never once had that problem with my Mamiya 6, until suddenly on holiday last year I left it on three times in the space of a couple of days. Now I'm paranoid about it! Fortunately my 'assistant'/tripod carrier noticed each time so I was able to re-shoot. He has his uses.
Originally Posted by RH Designs
I also didn't know that you don't have to make a full wind of the lever. Useful bit of info!