Two days ago I finally updated my Samsung Gear S3 to Tizen OS 4.0.
I was using Facer without any problems before that update, but now the battery drain is just terrible. The watch will not even last one full day.
I don't know if anyone talked about this since Tizen 4 came out, but I was just interested, if this is already known issue that is being worked on. Right now, Facer is not usable at all.