Title says it all.
Auto updated to 7.20 yesterday and as soon as midnight rolled around (I was awake) the stress level flatlined at 18. Since then over 18 hours it has not moved from 18. I've cleaned the watch with water, used it on the underside of my wrist, turned it on and off a few times, sync'd it again and no fix. Sleep data looks fine
I ran an activity and the HR profile looks completely normal and accurate. Anyone have any ideas? Please don't link the nonsense Garmin advise of "clean the watch, make sure it is tight enough". The fact that is has been 18 all day is pretty clearly a software issue.