Battery life??

Ive had the Fenix &x Pro for about 6 months now and I lobe this watch.  Only issue I have right now is battery life.  When I first got it it would last 28ish days on a charge now only 18 days??  Only thing I have messed with is the backlight. I turned it off so I could see the screen better.  I thought that might be it so I switched it back and still the max I can get on a full charge is 18 days??  Any ideas?