I have to reset my watch because of the HRV status,it was on red, unbalanced about 3 weeks, because after Porto marathon i give a break on my training,and obviously started to loose fitness. Higher RHR means low HRV,so my HRV drops from high 70'ms to low 50'ms and because of that my training status,my morning report,my training readiness was completely off every single day. It's really annoying. Hope Garmin look at this and improve their algorithm