955's firmware is rubbish and there are so many problems.
The heart rate is so inaccurate that it's no longer meaningful to wear a watch, and what are you doing when you're showing this inaccurate heart rate when you're active? I checked the phone notification on my smartphone, but it kept ringing. It's been a few days, but I haven't heard from you. If you can't solve it, recall the 955 series or find a way!