I just traveled from Florida to Alabama (0 to 1500 feet above sea level), and now my altimeter won't update while I'm using the watch. During my run or even just on the watch face it just stays stuck on one elevation. It appears the altimeter is actually working because when I calibrate it or the barometer manually I can watch it register and update the altitude dynamically. I've factory reset, soaked it for a half hour in warm soapy water, clean it regularly and meticulously, etc. Unit is around one year old. Any ideas?