This is odd and I'll be the first to admit I know nothing behind the science of watch movements. I have a Breitling Superocean 44mm Special OXF 1:1 Best Edition Black Dial on SS Bracelet A2824. This thing looks amazing and I have no idea how anyone could tell it's a rep. BUT, here's my problem: It will stop working in the middle of long periods of exercise (walking or running). I thought the whole science behind these were that movement keeps it running. Too often, I'll look down about 45 minutes into a walk and find it has stopped. But if I am just wearing it during a week without walking, it will go forever. Can anyone explain this??? At first I thought I was crazy and that I'd get torched for posting this, but I can quite predictably make it happen. Any input is greatly appreciated.