Apple Watch GPS and HRM not working reliably

My apple watch GPS doesn't work all the time. I use it for surf tracking and often times it never records the distance at all or obviously incorrect telemetry. If I turn the watch off and then on it will work for 1 session, then struggle again. In addition, the heart rate monitor takes 10+ minutes to get a reading when I am tracking a workout.

I have deleted and re-downloaded the surf tracking app but that does not fix. My friends have Apple watches and the same app, but do not have the same issue.