The past week or so sleep tracking seems broken. I've had a vivosport for over 2 years, and I have a pretty good idea of how it should work. Lately it's claiming I'm awake when I'm clearly not, and that I'm asleep when I know I'n mot. While it's never been totally accurate, it seems much worth in the past week.That deep sleep you get when you first fall aslieep is clear in the movement section; and lately it's been showing that I'm awake during part or all of that time period. Did they change something recently?