I've been tinkering with a Huawei 169 3G modem on Raspbian (Debian) with wvdial, gradually improving its penchant for disconnecting. When it does disconnect ppp tries to reconnect but can't because the modem has jumped from USB0/1/2 to USB1/2/3. I'm having trouble working out what process is causing the side step. Clues anybody?
3G modem side step
linux;modem;ppp;3g