The NordicTrack A2105 treadmill is a nice machine, but lately we have been having a problem. While you are working out, the beating heart will appear on the screen and it will give several different pulse readings and we're not even holding the bars that read the pulse. It becomes very annoying when you're watching the time so you can change elevation and/or speed for your workout. It even does that during preset workouts that are on the system. Is anyone else having that problem with the NordicTrack A2105?