When you mount your Contour on your helmet, do you have a problem with it coming off? I have gone through half-a-dozen mounts because one crash and the thing comes off.
Never, I even have a video when I got it caught when I was ducking under an avalanche warning rope at Fernie (it's not against the rules to duck them there, they put them down spines so people unfamiliar with the terrain don't get in over their heads). And you can see the rope catch under the camera, and then come back out.
Never lost a mount, but I attached it VERY securely. Cleaned the area with the alcohol wipe first, pressed in place, kept pressing, left to cure for 24 hr prior to boarding with it on...