PPPoE Session just Hangs...

I have implemented a PPPoE server on an RB433AH to end ppp sessions of my customers.
In a very basic stress test I noticed that after some high traffic is passed trought the ppp session this session stop responding (traffic drops), the session keep “stalled”, no way to get the session working again until you kill it and reconnect.

Can anyone help my with this issue?

solved!, don’t ask me, but apparently is a WinXP bug:

“…I think we fixed the Problem. We disabled all Authentication Methods besides CHAP and the Connection stays up and doesnt freaze any more. ms-chap and ms-chapII seam to cause the Problem. But actualy I dont understand why the authentication Method lets the connection freaze…”