Hi! I am facing the this issue since a couple of weeks.. I have purchased my Instinct in August of 2019.. worked flawlessly until a couple of weeks or so.. battery has been draining within a day! 23.5 hours to be exact (I turned on stopwatch and checked). I contacted Garmin support and they asked me to Reset + Software update using Garmin Express etc.. NOTHING WORKS.. now i am sure i have not done anything to the watch as we are in Lockdown, here in INDIA.. I've been indoors for almost a month.. :(