Powerbeats Pro Apple Watch and Spotify connection issues

I’m having trouble playing Spotify downloads on my Apple Watch to my Powerbeats Pro. I have a downloaded playlist on the watch, and the Powerbeats show as connected to my watch when I check Bluetooth connnections in settings. But when I click play the song plays for only 5 secs and the stops. Then if I click the watch icon at the bottom of the Spotify app to choose which device to play on, the Powerbeats pro aren’t there. I’ve had the Powerbeats Pro checked under warranty..they are all good….so I suspect it’s a Bluetooth connection issue with my watch…or maybe the Spotify app. Anyone else had similar problems???