@samualr, I have recently been trying to find what the cause was but it's recently been a bit hit and miss. One of the things I did notice was at night my watch would suddenly light up like a Christmas tree for no reason. I had thought it was possibly when I moved the bezel in my sleep but it also happened when the watch was on the side desk. So what I did was take off bezel wake-up off for a day and then back on also wake up gesture set to off. Since then been able to get a least a day or so (but my do not disturb is on from 10-6 Monday-Sunday). Another thing I did was backup my Frontier (so to preserve my faces) and then recover from backup after a factory reset and uninstallation of the wear app. With regards to the charging I did also notice this for a couple of days AFTER the Tizen update to fix this un-plug the charging station place the gear on the dock POWERED so it discharges the dock completely then plug it back in at the next Charge cycle so it's a clean charge that should read and then charge the watch from scratch. BTW switching on all notifications did nothing but drain my gear quicker. Please also check your handsets as my wife's classic was having the similar issue and what fixed hers was her S9 needed a software update (which meant the Wear app was also updated) and she gained a day worth of use. I tried it with my S8 never worked for me but something for others to try.
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