squid dns problem

Hi,
We were using squid.2.1.PRE1 on slackware 2.0.36 without any
problem until now.
However from now on,it gives following cache.log output saying:

1999/02/05 14:59:58| helperHandleRead: FD 5 read: (110) Connection timed out
1999/02/05 14:59:58| WARNING: dnsserver #1 (FD 5) exited
1999/02/05 15:01:59| helperHandleRead: FD 6 read: (110) Connection timed out
1999/02/05 15:01:59| WARNING: dnsserver #2 (FD 6) exited
1999/02/05 15:04:42| helperHandleRead: FD 7 read: (110) Connection timed out
1999/02/05 15:04:42| WARNING: dnsserver #3 (FD 7) exited
1999/02/05 15:06:04| helperHandleRead: FD 8 read: (110) Connection timed out
1999/02/05 15:06:04| WARNING: dnsserver #4 (FD 8) exited
1999/02/05 15:06:08| Starting Squid Cache version 2.1.PRE1 for i686-pc-linux-gnu...
1999/02/05 15:06:08| Process ID 1033

and as it can be seen, then it starts new squid process. This keeps going
until no web traffic permitted totally!

5 dns server processes configured in squid.conf
squid is executed as squid -D
Please help!
Regards...

************************************************************************
** Aytac KOCAPICAK * E-mail: aytack@bilkent.edu.tr **
** Network Engineer * Phone : +90(312)2901622 **
** Bilkent Computer Center * **
************************************************************************
Received on Mon Feb 08 1999 - 05:13:01 MST