My imessege will not reactivate when I sign in to my apple id
I have been having problems with my imessege and FaceTime. They seem to work for periods of time and then all of a sudden it deactivates itself and I cannot sign back in. I've made absolute sure that I am writing the same passwords and apple Id. I have also tried signing into my alternative address and it still won't do anything. It slides along to the part where it asks which one you would like to used after I click sign in but goes straight back to the sign in part. It is extremely frustrating considering I have changed my password several times and switched my addresses too. I've changed the DNS numbers as well and its made no difference. Some straight forward help would be great!
iPod touch (4th generation), iOS 6.1.1