Great app but some problems

I think that this is a very convenient app to use and makes it so I dont have to get on my computer and use it, however today I saw that I no longer have the app so I tried to go to the App Store and download it again but it said I have it and showed an open icon. I tapped the icon but it didnt work. Im not sure if this is my phone or TS3 not working

Branon Deitsch about TeamSpeak 3