I use Spotify on Apple Watch cellular with AirPods Pro without my iPhone.   
i  use it by running workouts and here are actually two problems:

1. if I want to start running I am connected to my wlan and the iPhone is near by I cannot use Spotify with Apple Watch cellular. If I go out and a few meters of my wlan range then it works correctly. 
Is it possible to start the music at home and not while I am running?

2. Then I come back and i am again near by my iPhone / wlan the music stops and the AirPods connects to the iPhone. If I start the music again over the AirPods it plays the last track from the iPhone and not from the watch. If I go away from the wlan range the music stops again and then play the track from the watch again. Very annoying if I walk around the house while I want to hear the music. 
is it possible to change this „connection switch“