Paid Version Not Working

Every time I open up Ummy, the app tells me "Service is unavailable" and ,as you could imagine, the app doesn't work at all. It started doing this about a week ago. If I delete Ummy and then re-download it, it works for downloading non-music YouTube videos but if the video is marked as having music in it then it doesn't seem to work. After I close out of the newly downloaded instance of Ummy then it goes back to the ol' "Service is unavailable" status. Please help.