Board Thread:Game Discussion/@comment-30301489-20161110104443/@comment-26388545-20161114234252

There are separate volume controls for sounds and music within the game. Go to the settings menu (gear icon) and see if they got changed somehow. If changing that doesn't work, force close app and restart your device. If THAT doesn't work you may need to re-install the game. Cloud save first if you do that! My last re-install was scary, but it eventually worked again.