Fenix 5+ saphire powering down constantly

The battery does not go down, the watch just shuts down. I did an update on Thursday once I got restarted. Fully charged it has shut down 2 times since. I am at 85% battery, used 15% in 55 hours. I don't think its a battery problem. Tech support said the update would fix the problem because I was behinhd on map updates.

I have seen this happen before. But then the reason was a wrong/faulty firmware installation. Have you tried to reset the watch an re-apply the firmware?

I am experiencing the same issues with  fenix 5 plus for a while now. Tried both Soft and Hard resets, which helps only temporarily for a day or two, depending on activities. My watch powers off and enters reboot loop if I try to connect it to the PC. Very annoying

What FW / GPS / Wi-Fi CIQ/ ANT/BLE  etc. version are you running?

What bluetooth devices have you connected to the watch? what watch-faces have you installed?

Thanks for following up.

My software version 18.00 (61a9197). I used to use Titanium watch face by Garmin and SHN Feinix 6 style by SHN, and DashFit data field but these persists even if I do not install any watchfaces/datafields after hard reset. With regards to bluetooth, only iphone. 

Same as mine 

My versions are:

GPS: 2.70, Wi-Fi: 2.50
CIQ: 3.2.8
WHR: 20.03.32
ANT/BLE/BT: 6.15
Sensor Hub: 2.41

And I am only using the Quatro wath-face. No Wifi-setup only Bluetooth. 

Bluetooth connections Iphone and Apple Powerbeats Pro.

Works like a charm - not battery problems at all. 

Settings: Light is off unless a tick on the light-button.

I will wait for support response and could share here if it will fix my issues