Disconnecting on iPhone when closing app

Disconnecting on iPhone when closing app

Just bought one of these for my dad to use with his iPhone 5, and everything works for the most part except that when he closes the app by pressing the home button twice and swiping the app up, it disconnects from the phone. This is very inconvenient as with my Galaxy 6 this does occur when I close the app. Is there a setting on the iPhone that I am missing that can stop this from happening?