So I started seeing excessive battery drain when I upgraded from 13.15 to 13.21 (see this post) and thought that 13.22 fixed it as I saw the battery drain return to 4-5%/day in smartwatch mode. That was Thursday 12/1. Last night I noticed the battery had drained more than I thought it should have (3% vs 1-2% for the same time) but thought nothing of it. However this afternoon I checked the battery and am now seeing about a 1% drop every 1.5-2 hours.
I don't expect the battery's discharge rate to be linear (currently at 55%). But that kind of jump is crazy!
So I have hard reset the 955 in hopes that whatever was running in the background has stopped. Will update this thread in a few hours.