Online Game Problem

['Sheed]

i'm using andrew roster, and i'm playing with my friend on the net, and every time i double-tap the one of the quick-keys so it'll call a "special" play, the game crashes - well, not really, it just saying the connection with the opponent has lost.
someone know what the problam?
edit: oh sorry, i forgot, please move it the technical issues forum, my bad.