Forerunner 970 - no responsive and freeze

Hi

Since yesterday i am not able to use my watch. 

I am on Switzerland.

Even i try to restart a few time even with the usb cable, everytime it turns on 

- checking maps and trying to download maps but stay on that screen, don't download any maps and don't turn completely on.

- If I go through, I am in the main menu but no buttons are responsive. Impossible to switch menu even with the tactile screen. Nothing happen and it just turns off, with blaklck screen

- start and restart alone.

I don't know what to do and I am a bit surprised. Could you please help me to fix this issue quite urgently?  

Thank for your help