Whn voice chattng in Ymsgr my connection goes off after 2.27 mins each time. hav 2 call again.Whats the prob?

I have been voice chatting with the Yahoo messenger with voice(BETA) downloaded recently. My connection is going off after 2.27 mins of talk each time. I have to keep calling again each time. If any one has solution to this or have faced the similar problem. pls let me know.