Mw3 Server Error

I have a problem with the mw3 servers

I have got a ban?

Thanks was an accident but cannot un-thank , there is dejavue going on here

If it is a connection issue and you have

logged out of steam and back in and no vac ban shows
you have verified game cache on both SP and MP
You have rebooted
your nat is open

then if it still happens

you are manually banned.

if you log into game and it says "Cheat Detected" you are VAC Banned