Changing resolution / connecting screen resets HDMI audio

Use-case:

• HDMI audio, multiple screens
• Play song in Spotify
• Change screen resolution, frame rate or switch monitor off and on (not the screen with HDMI audio)
• Audio stops, Spotify says "Can't play the current song."
• HDMI profiles in KDE audio settings are doubled
• Spotify needs to be restarted to work again

Might be related to #466 (closed).

Videos played in Firefox stop as well and can't be restarted.