Fair enough. And I do believe you're having problems with the watch, but just as a diagnostic exercise, have you tried taking a few days off exercsie, booze & caffeine and just seeing what happens? Does it still register wonky stuff?
The reason I ask, is that I suspect the "hard reset trick" is simply erasing your "history" from memory and "forcing" it to assume you're starting from a "default" state of "total rest". So in other word's it's not actually fixing the problem you're having, it's just forcing it to "start again in a rested state", which quickly goes "wonky" again once it starts collecting data.
As I said, I'm not trying to say you're doing anything wrong or the watch isn't broken, but just as a diagnostic, it might be useful to see what happens if you just take it really easy for a few days, if you have not already tried that?
I appreciate everyone's input, but many people are missing the point of my original post. There has definitely been a change in the algorithm to calculate all day stress. That change may work for most people, but for a good number of people it does not. The changed algorithm results in many people, like myself, having extremely high stress scores WHILE SLEEPING. In fact, my highest stress scores on any given day are WHILE I'M SLEEPING (usually between 75 - 100). Yes, the numbers may not "mean anything" in terms of what the scale is so I'm not concerned about the scale itself, what is annoying is that whatever the numbers are, they should vary with the amount of stress and it's hard to convince me that my most stressful times are when I'm asleep. In addition, as others have reported, a hard reset does fix the problem for several days, but after 2 or 3 days, it goes back to what it was. Extremely high stress when I sleep, high stress all the other time, even when I'm lying on the sofa reading a pleasant book.