Fenix 5x draining battery in about 10 hours

Last days my Fenix has not made it through the day.

After some experiments I found out that drainage is normal when I have the wrist HR turned off.  When on, the leds are constantly lit (not blinking as usually)  Maybe they are also brighter, but that might be my imagination.

Have tried resetting with no luck

Maybe 3 or 4 times in the past years it has happened that  the watch drains this quickly, but after going off when battery is empty, everything has been ok when charged again.  This time it is not the case though.

Anyone experienced this or has any suggestions?