Sudden Sound Loss on Sonos Era 100 While Playing Apple Music via Sonos App

I am using the Sonos app to play Apple Music on my Sonos Era 100, but sometimes the sound suddenly stops. When I check the Sonos app, it shows that the music is still playing normally. In other words, the music is playing, but no sound is coming out. If I stop the music in the Sonos app, switch to AirPlay to play some sound, and then return to the Sonos app to play the music again, the sound comes back. What could be the cause of this issue?