for the past 4 months or so i have been unable to play any xbox live games on windows phone because it wont let me sign in within games, whether it was on my samsung focus or now on my 920. I can still sign in to my account in the basic games hub or on the xbox website so i have no idea what is causing this. Every time i start an xbox live game that requires you be signed in to play it gives me an error and then the game is essentially useless. The only two games i actually care to play are alphajax and wordament and since they became xbox live i can no longer play them.

any suggestions?