I just noticed that my Vivoactive 3 has stopped registering HR data, as of a couple of days ago. It seemed to have been working as expected until that time. I have tried various combinations of power cycle/reset while turning the HR sensor off and on in the settings menu. The sensor itself appears undamaged, and I have cleaned the surface to ensure that is not the issue either. The green lights on the sensor are not on at ANY point in the power on/off/reset cycle. I appreciate any advice/steps you can give regarding a solution. Thanks in advance!