xbox360 log in issue.

[stethebubble]

this has happened twice now and i have no idea why.
i log in and it auto puts my account as player one.
then on the second controller i log my friend in. i am auto logged out of player one.
anyone know what the hell is going on with my xbox 360?
we was already to carry on our army of 2 game but couldn't play on the xbox 360 together at all. had to boot up the trusty ps2 instead.

[ffxik]

Can't say I have ever had that one happen.  What happened after you tried to log back as P1?

[stethebubble]

Can't say I have ever had that one happen.  What happened after you tried to log back as P1?

it starts asking for username and password.
what i put doesnt work. so i have to restart the xbox.
it happened when my and my daughter went to play lego batman 2 a few weeks ago.
and then last night when me and a friend went to continue army of 2. (it worked fine the week before.

[stethebubble]

xbox said i need to clear my cache and redownload the profiles