I know this is an epic old thread resurrection, but I found it interesting. I have an issue with a A7750 right now, the hour brake is not slipping, i.e., the hour counter remains still during normal timekeeping, what I am experiencing though is when the chronograph is used, stopped, and then reset, the hour gear moves to random places, and does not reset to 12 as it should do. Starting and stopping the chronograph, and resetting it each time, it does eventually align to 12, but probably more a coincidence?
Anyone know what could be the cause of my specific issue?