Basically; whenever I dashboard, or go onto a game (even an Arcade game), my account is disconnected.
An. example is, let's say, if I put in Battlefield 3. As soon as it begins to load, I'm disconnected; no biggy, just sign back in and continue playing; oh, a friend came on and wants to play another game? Alright then, to the dashboard! Damn, it signed me out AGAIN. Right, I'm back on and inserting the disc now, give me a moment. Game loading, and, signed out AGAIN!
Alongside that but not as bad is my brother has had issues relating to that e-mail and password thing, and because of issues with that we are entirely unable to play Splitscreen on a game without it forcibly signing my account out.
So, uhm, yeah. Any help for the main question (about my account signing out whenever I dashboard or insert a game or even play an Arcade game) would be dandy.