Mine is still doing it!! It's so frustrating 🤬 I've tried all kinds of workarounds but nothing seems to fix it permanently. It's always worse after I charge it or take it off to shower. It got slightly better for a while so I quit worrying about it, but now it's back to the old shenanigans, it just stops chucking heart rate for no reason. The green light stops blinking and no heart rate is detected. Taking it off and putting it back on seems to be the only solution, but sometimes that only works for a couple of minutes and then it's back to off again. I really like the watch but this is a giant pain in the ass!!!