False fall detection on Apple watch

My Apple Watch is fairly new about six months ago. I’ve had at least four false fault detection alarms. I’ve caught them each time and dismiss them but I’m concerned I might not be quick enough to do that. Once I was doing yoga and went from standing to sitting, no fall. Another time I was lying down on a PMF mat and it went off. Another time I was sitting and meditating. I don’t remember the fourth time. Once when I did actually fall. Nothing happened. I haven’t called them yet but I guess I should. What good is it if it doesn’t work properly?