V.92 modem disconnecting problems

Win98 with P4, 1.6G
I have a generic v.92 modem that keeps disconnecting me from my ISP after 1 min to 10 min (usually closer to 1 minute). Message is :your connection has been interrupted.
Does this have anything to do with ISP support of v.92 protocol? Maybe network settings?
My modem config is not set to fast. I updated my telephon.ini file. Modem driver seems to be up to date. whats up?
Thanks
Kelly