Frustrating issue while using my Plantronics bluetooth headset connected to my Pixel2 Android phone. The music would pause at what appeared to be random times while listening to Pandora. I tried a variety of things but ended up finding a simple solution.
Go into settings for sounds/notifications and tun off all notification sounds. As soon as I did this, the music no longer paused. The pauses were being triggered by notification sounds.
[update. Turned out to be a conflict with the bluetooth on my chromebook. Turn off bt on the chromebook and problem went away.]