I have a Vivosmart 4. I go on walks, play racket sports, etc. and Intensity Minutes used to capture these activities and record them as Intensity Minutes. As of a few weeks ago, I have had 0 Intensity Minutes regardless of the activity that I participate in. My RHR has not changed and hovers around 50-60. How can I get the Intensity Minutes back. I've read through various threads but none of them really helped my specific situation on my specific device. Thanks!