I have noticed another issue with FR955. I'm getting incorrect elevation gain for my runs. This happens always only for the 1st lap (kilometer).
I'm attaching the data (screenshots) from activity FIT file to clearly show the issue.
As you can see, ascent for the 1st km is 42m according the FR955. In reality it should be around 7m, so the device measures 6x higher!
Also please note, that I always wait a couple of minutes before the start of the activity, even after the watch gets GPS lock (to ensure proper altimeter calibration).
It looks that this issue started with 18.23, and it's even more noticeable in 18.26. Until then, elevation gain has been reliable.
