Just an update on this post. I found a solution that worked for me. It probably won’t be a solution for others as this seems to be a bit if a mystery on why this happened.
The short story: I deleted all those third party watch face apps. That fixed it.
The longer version: First thing I did after having the watch off all night was reset it as new. Took awhile because the battery drained really fast while it was repairing. Had to wait for it charge back up so it could finish. Honestly, it was a waste of time. The watch wouldn’t even charge. Stayed at between 15 and 17 percent.
In one of these threads here someone mentioned removing the watch face apps ( it was either Facer or Moby Face) so on my iPhone I deleted all of them (I had four) and waited. My watch was at 100% within a half hour. And it was cool to the touch. Not hot. It is now about 7 1/2 hours later and I’m down to 74%. Which is normal. I expect it to be better tomorrow because I won’t be fiddling with it as much. This also solved another problem (which I posted in another thread) The iPhone Watch App was misbehaving. All changes made to any of the faces, added faces or deleted faces wouldn’t sync over. I couldn’t even change faces from the app. This fixed that too.
Not sure why these app made this mess. Bad code. Not updated for watchOS 10. Who knows. But if you have these apps try deleting them.
edit: Seems to be what others are saying. Delete those apps. That should do it. But like I said. Might not work for everyone.