Apple Watch Series 5, running Watch OS 9.5.1 stops recording heart rate in swim workout
I've been using my watch to track swimming workouts. Lately, it stops recording in the middle of the workout. Today for example, in a workout of 1 hour, 15 minutes, it only kept track of my heart rate for about 30 minutes. I have it on as tightly as it will go. Picture shows the break in recording.
Any suggestions?
Apple Watch Series 5, watchOS 9