17.30 update HR Data during outdoor cycling very variable and inaccurate.

Since I did the 17.30 update during outdoor cycling my HR goes mad, adding more than 100BPM to my actual HR. If I restart the watch the HR goes back to normal. This line is where I restarted the watch and it is back to normal.

It seems to be OK for running.

I have adjusted the fit, cleaned the sensor moved away from the wrist bone, all the usual things. It seems to be a bug with the new firmware. Very frustrating.

0 pxl 2 days ago

this kind of jumps in the HR chart are very typical for garmin watches

this may come and gone (occurs less with different conditions, such as how tightly you wear the watch) with FW updates, but never gone forever, because these "fixes" will actually cause to have the same problem with other cases

garmin is unable to fix this for 2-3 years now (it started with the forerunner 265 and then it gradually infected all other watches)

if you are lucky, you experience it very rarely - otherwise, you are out of luck

0 R R 2 days ago

Unfortunately also with running (with Stryd pod & Fenix 8) and especially during warm up (for me). Heart rate goes up unnaturally and when I stop and let it rest like ten seconds (and halt the run) it is back to normal. It messes up all health indications like VO2Max, recovery time and body battery. First time I noticed it was Wednesday September 17. And all remarks on wrist tattoos, tightening the band and such.....not relevant for long time runners with a lot of Garmin experience.

https://forums.garmin.com/outdoor-recreation/outdoor-recreation/f/fenix-8-series/422757/heartrate-bug-back-again-and-processor-issues