(BUG) HR monitor function during activity broken

As of the new update HR monitor function during activity is broken. Will not read above slightly raised resting HR

Version: 15.77

If this was a build 15.77 bug there would have been so many posts! Provide more details and people may have suggestions on things to try but if you have done some troubleshooting already then contact support. Does the HR go up when you exert yourself in some way but not when the watch is in an activity ? Have you adjusted tightness, done a reset etc? When not in an activity is it accurate ….