Rhythmbox freezes completely for 1~2 minutes at least once in my sessions. I can't tell what exactly triggers it, but most of the time it happens when trying to click on a different track. I click it, it stops responding before it can play that file.
Rhythmbox freezes completely when opening .ogg files. I was able to reproduce this almost every time. During this time Budgie also freezes and after a minute or so the Rhythmbox process is automatically terminated.