Connection problem

I can't connect my Fenix 8 47mm amoled with WOO3 sensor. 

The last successful connection was in the 31 of October. 

The WOO is fully charged and able to establish a connection with smartphone

Deinstallation and new installation of Garminsoftware doesn't help. The watch simply doesn't find the sensor which is located very close. 

How to rectify the problem?