Game center not working on iPod touch

Just recently, one of my friends sent me an invite to play a game with them thru game center. once I clicked on the invite, it never loaded, wondering why, I tried to send them an invite, but game center showed an error message that said it could not connect, so Ichecked the wifi to find that it had all bars. I was even standing right next to it. Confused, I tried the one fix that always worked on computers. I turned it all the way off, hoping that it would work after that, but it didn't. After turning it on again and opening game center, it still came up with a blank white screen. My friend sugested checking the game ceter catagory in settings, but that wouldn't load ither. does anyone know what is going on or how to fix it?