WHR at low ambient temperature not working

Former Member
Former Member

I did some outdoor activities in the past weeks and always had my fenix 6 with me, but I never get valid hr values. 
i always try to update the watch with recent beta software. That helped at least, to work for indoor activities. 

is this a known issue? 

watch is placed as suggested, tight and behind the wrist.

Software: 5.77

Sensor Hub: 4.20