Backlight is always on on Garmin Fenix 5s version 25.0

Hi all, I notice that my Garmin Fenix 5s is now with the backlight always on. It's extremely battery consuming and I can't figure out how to fix it! 

I already hard reset but it didn't solve the problem. I guess it's a problem with the HR monitor because the sensor's green light is always on, and as soon as I take the watch out of my wrist, the screen lights turn off. I also turned the HR monitor off and the backlight was "normal" again, and as soon as I turned it back on, the backlight won't turn off again.  

Can anyone help me with this?