Is the App or the iPhone causing the issue? So about a month ago I started using the Nike+ GPS app and everything was working fine until a few days ago while using it, my ipod starts skipping and the voice control automatically pops up. At first I thought the app had glitches but then even after i close the app, my ipod was still skipping and that voice control thing popped up. So should I restore? Is there a problem with my phone itself? Or is the app the one that caused this issue? 

Thanks in advance for your input.
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.