[hsflinux] System crashes only while surfing on the net with HSFmodem drivers

[Pierre]

Hi,
I have a Redhat 9 and an olitec PCI 56k and I use HSF drivers which work 
often great. However, sometimes, my system crashes completely 
(impossible to change console or to type something, pushing the reset 
button is the only solution) when I am connected to the internet using 
the drivers. When it happens, all the lights of my keyboard continuously 
flash (caps lock, scroll lock and num lock). I had the same problem on a 
redhat 8 and on my girlfriend computer which is completely different of 
mine. There is nothing particular about this in my syslog traces.
Any ideas ?
Thanks for your help