Barometric sensor broken.... Again

Recently I noticed that again the recorded height during activities is not correct. The watch calculates to much height differences. Also at night during sleep the height differs with tens of meters.

I got a replacement for this exact reason in December 2025, this replacement is now doing the same. 

I’m wondering what could be causing this. I wear the watch 24/7 and have a close relationship with it, do 4–6 cycling and running activities per week. The watch also goes to the shower with me, but I don’t participate in any water sports.

Is the barometer in the Forerunner 970 or a Fenix of better quality? 

  • my 1st 965 was perfect (from the very 1st batch) , but it had burnt in display (with OFF setting...) after 2ys, but the baro was pinpoint all the time, the overnight measurement was stable, not moving up and down. the 2nd 965 is moving even 100m +- overnight and the measurement is very "wavy" during activities too, but during cycling, somehow the auto-elevation calibrating corrects it often, and the total ascent at the end of the rides are correct, but during hike the TA is 3x bigger than the reality (probably lack of auto-cal or smoothing in TA, i dont know). so i will replace this watch too before the end of 2ys warranty for sure. 

  • my 965 drops 50-100ft every time I stop during a run.  the amount of drop correlates to the duration of my stop.  so, a 2min stop is ~80ft.  once I start running, in a min or two, the altitude comes back to normal- but the watch then thinks I'm running uphill and messes up my power metrics.  I called garmin on this, and they had me clean the sensor, reboot and such.  nothing made a difference.  the watch otherwise works fine.

    but the thought of a new Fenix 8 is enticing.  

  • I don't know. Alti/baro sensor of my 955 stop working after two years. In my 945 after 2 years again.  I never used my 970 in the swimming pool and it's ok after 15 months, but I don't use it in the water because I'm scared about mic/speaker. I want buy 965 for this reason