Garmin Instinct adds 20km in first 5 seconds of activity

I run a lot and sync my Garmin Instinct device to the app daily, and my gps is accurate for the whole run EXCEPT almost every time I start the activity (run or trail run) my gps glitches and adds about 19km in the first 3-10seconds. So I pause the activity, delete and start again and it usually works fine second go (although some days it glitches again 2-3 times). What is going on???? How to fix???

0 trux over 2 years ago in reply to gehcoss

gehcoss said:
THANKS. My Baro shows "VALID" and the alti shows 20000. Smile.
This means SOFTWARE (S/W) not hardware-problem to me.

Not necessarily. If the elevation does not change at all when you move a floor or two, then the sensor does not work. Whether it is due to a hardware failure, due to a broken firmware, or due to some odd combination of conditions is hard to tell. However, you still have only the few options I listed: either attempt to repair it (deleting locations, master reset with deleting all data, reinstalling the Sensor Hub firmware), or disable the altimeter (sensor mode "barometer only") and use GPS elevation + Elevation Corrections instead, or send the watch back to Garmin for the exchange or repair.