Since the update to 10.43 this last week I face serious issues with the altitude tracking of actrivities.
Yesterday I did a Mountainbike ride which was 470m planned I the Fenix recorded 730m.
Moreover today I did a long 4k walk at the beach.
As you can imagine there is not much ascent and descent when walking along the beach but Fenix recorded 45m ascent and 70m descent.
I also switched the altimeter calibration from Auto into During Night and calibrated manually at the beach.
Never had such an issue before the firmware update to 10.43.