Inaccurate Body Stress and Body Battery Readings Since Upgrading to Version 3.31

Hi, 
Since my VS5 updated to version 3.31 at the beginning of November, I’ve been receiving high stress and low battery measurements.
Compared to my Fenix 6, the measurements are definitely out of the real range.
I already performed a factory reset on my phone, but there was no improvement.
Is there any way to fix this or downgrade to version 3.29?
ThX
Peter