I've had the handlebar mount for Planet Bike Protegé wired computers (two of them) fail after ~5-6K usage. In both cases, the computer didn't read all the mileage of the ride (e.g. the contact link was intermittent), or would not awaken (no contact). It had become "grindy" when the computer was moved in the mount, also. I cleaned the mounts and filed the contacts shiny, but the issue returned right away.