I haven't found a solution for this yet with Rhythmbox/Banshee, but thanks to the recommendation of a user on the Ubuntu Forums I found that Clementine is a substitute for Rhythmbox/Banshee that is not affected by this. I installed Clementine and it works great without any playback problems.
-- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/978604 Title: Banshee/Rhythmbox regularly stop playing audio when left on in the background To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/pulseaudio/+bug/978604/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs