I've had a Vivoactive 4 for about 2 years and I love it but I've recently hiked a pretty famous mountain that's known to be 4,167m high and my Vivoactive 4 recorded my maximum height that day as 3,968m which is obviously 200m off. Horizontally it seems to be fairly accurate but this vertical discrepancy is pretty terrible. Is this common or is there a fix for this???