I also have an Active 2 40mm bluetooth. Bought in January 2020 and had no issues. Battery lasted 1 and half to 2 days with conservative use and 1 day with always on display, wifi on auto, location on and heart rate on continueous. From 2 days ago I've seen battery drain like I've not experienced before. I turned off the wake-up feature but left wifi on auto, always on display and location on and heart rate on continueous. Battery would then normally be at 66-70% and I saw that these changes had it at 76% yesterday morning. Today I've had battery drain from 88% this morning (about 05:30) to 6% at 11:30 (same morning). I normally workout for about 35 to 40 minutes in the morning. That was the extend of the use. The watch face I use is a dark face (analogue watch face) with no animation. I've now charged it again, back on a Samsung watch face, used the battery optimiser so almost everything is off except for the heartrate monitoring. I've also restarted both the watch and phone. I don't use Bixby, but that was the only app that had an update and am wondering if its not misbehaving. I will forced close that on the Wear app, just to be sure.
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