24.12 update and excessive battery drain

I’ve just updated my forerunner 165 (not music) to v24.12 and the battery has immediately gone from 7+ days with several tracked activities 4-5 hrs total)  to less than 24 hours.  

This feels wrong!  

I have a custom watch face that is *very* simple.  all black with HH:MM, day/month steps, battery and HR.  

 Anything I can do? I’m away travelling at the moment and kinda need it to work.