So I installed OS4 yesterday and love it, except for two issues with heart rate tracking. First, it sporadically will give a way-off reading (like a one-time 180bpm when I was around 60bpm). The other issue is that it will only record an HR reading when I manually check it. It went 8 hours today without recording a single reading. Anyone else having similar issues? Oh yeah, and my standing is no longer recorded at all (zero all day).