[Terry]

Doesn't sound like the whole story to me.

Do you and your friend always play at the same time? At the same table? In the same tournament? Were both accounts opened from the same computer? Do you play your account on your friend's computer? Does he play on your computer? Have any other friends been banned? Do you use some sort of virtual machine? Do you have some processes with unusual names running on your computer while you play? etc., etc., etc.