Game Center keeps signing me out
I have an iPhone 4s with iOS 7. Every time I try to open a game on my phone, I get a pop up asking me to sign into game center. This started a couple days ago and it is really annoying. What makes it worse is that it doesn't even let me sign in all the time. Sometimes it allows me to sign in to game center and sometimes I get a message saying it cannot connect to server. Its really annoying and frustrating. I am not sure what to do to fix this.
iPhone 4S, iOS 7.0.4