I confirm as well that today everything was as before after the reset of the Bluetooth. It asked me right away for PIN in GCM and it paired from the second try. Although it showed my device Fenix 5 as quatix it paired and all day is working fine. Thank God. Now I am afraid to update GCM as it may broke again something.
I saw now that if you go in Bluetooth options you dont see the watch as paired nor as previously connected. Really strange.