[KMPLX]

I don't know if anybody has ran into this lil problem but for some reason there are times where people call me and it doesn't ring till an hour or so later but it just rings once so I call the person back and ask them about it and they tell me "I called at you like an hour ago but your voicemail picked up" anybody else has had this glitch happened to them....? Ohh by the way it only happenes when I have this app running, so answers if you know if I have to do anything to my settings I would greatly appreciate a response.