Anyone else have muting issues? – Walkout Song DJ Review

I just started using this app and love how super easy and user friendly it is. So easy I can easily download more songs in between innings. However, I'm having an issue with the volume. After I play 3-4 songs it's locks my phone into the mute position. Once it locks up I can't unsure it on any of my apps. There is no rhyme or reason and there's no magical way to unlock it. I just leave it alone for a while and it starts working again. Frustrating when it locks up at key times in the game. Just wondering if anyone else is having this issue? Thanks!
Review by sulyjo on Walkout Song DJ.