Is the App or the iPhone causing the issue?
I don't think it's the app that's causing the issue. And I believe there are two separate issues with separate causes. 

First, the skipping issue could be caused by a corrupt iPhone music DB - this is fixable by re-syncing the iPhone with iTunes. 

Second, voice control could kick in automatically if you use some kind of accessory such as headphones. Try not using this accessory for a while and see whether the voice-control issue is sorted.