Fenix 5, v19.10, 2.60 GPS: Altimeter problem

After updating to 19.10 for some days everything was fine.

After that I updated GPS from 2.50 to 2.6...

I am not sure if it was after gps update BUT 2-3 days now, problem with altimeter (baro?) have started..... The ss below is taken while activities in completely flat road (or with altimeter differences no more than 10-15 meters (to a 5k distance)

This one is during test walking... I had a continuous increase from 165 m to 4000!!!! After manually correcting it (where the picture show falling the altimetre, after that increase again….

After this.... I had soft reset.... Enerything deemed to be ok, during stund by.... until me evening run:

This one is from todays run..... again in completely flat road.....

The only thing I have installed is a battery momitor widget, nothing else....