No more HR wrist after 2 days (brand new Fenix 5)

2 days ago I received a brand new Fenix 5 from Amazon.

Everything was working fine, after it updated to 14.20. Then wrist based HR stopped working.

It's set in AUTO and even the leds start to blink, but the widget keeps saying MEASURING or ---

Same with using "BROADCASTING" or starting and activity.

What bugs me is that it is an almost 400$ watch, that it's supposed to be solid... and I expected to be the perfect successor to my Fenix 3. Turns out I was wrong.