Apple fitness + apple watch crashing consistently

I use apple tv + apple watch. There are two different paths I've been experiencing consistently (more than once a week).

1. During a workout, the apple tv app crashes, causing the workout to stop. Apple watch will update my rings and I am able to resume it if I try it back.
2. During a workout, the watch and the tv fitness app do not show stats from the apple watch (heart rate and calories) for some time. Eventually the app crashes (I've experienced this happening after a few minutes but also after 10min in the workout). After the app crashed, the rings won't even update showing any kind of workout I've completed. Also, the workout is marked as completed so I can't resume it.