How can I fix frozen heart rate readings?
This can definitely be frustrating. The issue is caused by an occasional Apple Watch sensor bug that affects all workout apps, not just Milo. Until Apple provides a long-term fix, we’ve found a simple workaround that works reliably.
The quick fix: the 10-second reset
Pause your workout in Milo.
Hold the arm with your Apple Watch completely still for about 10 seconds.
Resume your workout.
This usually resets the heart rate sensor and gets it tracking normally again without ending your activity.