Why my ps3 keeps singing out??

May be...

my ps3 sing off the play station network but then when i sign in again it works, but then signs out, the error message that comes up is always different as well.

i have tried reseting the router, looking up the error messages on Google and doing what the other people have done but it still doesn't work

please help,

have you updated your playstation 3 to 2.40 if so that is the problem

cus you dont have a 360

it happened to me but not much often so i dont know why? maybe it gets disconnected like in online games