iChat Trouble

Recenly or maybe since i installed the 10.5.3 leopard update on my mac, everytime i attempt to log into my aim account on ichat, it freaks out, connecting and disconnecting until it time out giving me this message, this then makes my aim account unusable for the next 10-20 minutes, i think the problem lies with ichat because when my account becomes usable again, it works fine on Adium, if anyone else has this problem or any advice on why its happening and how i can fix it leave comments thanks