[USR-TC] New Code: Winmodem Bug

We've nailed down the USR Winmodem problem with the latest code. Any suggestions for a fix? We connect using the winmodem and immediately (within 5-10 seconds) start sending/receiving traffic. For example when we connect to just check email, the modem traffic stops after about 10 seconds. We stay connected. If we instead log on, wait 15 seconds or so, then do our stuff, everything's fine. This is happening with a number of models of internal USR and OEM Winmodems. --- Update: we tried shutting off CCP, v.44, v.92 options as well as ppp offloading, same result.