Heart Rate error on running race

Hi.

After a recent update to 3.10, my heart rate does not work during my running race.

HR works fine at first, but it doesn't work properly from the middle of the run.

1. October 3 10km run 

https://photos.app.goo.gl/RT1kBnGc1KFGQhAMA

2. October 6 10km run

https://photos.app.goo.gl/RT1kBnGc1KFGQhAMA

3. October 9 10km run

https://photos.app.goo.gl/RT1kBnGc1KFGQhAMA