Squid shutdown ...

Hi.

I have a problem with squid 1.1.8 on UnixWare 2.1 (SVR4).
Squid correctly start and works.
But a bit later silently falls.
For example, the cache.log may contains:

97/04/03 19:30:05 | Starting Squid Cache version 1.1.8 for
i386-univel-sysv4.2MP...
97/04/03 19:30:05 | With 2048 file descriptors available
97/04/03 19:30:05 | Performing DNS Tests...
97/04/03 19:30:05 | Successful DNS name lookup tests...
97/04/03 19:30:05 | Started 10 'dnsserver' processes
97/04/03 19:30:05 | file _ map _ create: creating space for 2097152 files
97/04/03 19:30:05 | Swap maxSize 81920, estimated 4096 objects
97/04/03 19:30:05 | Target number of buckets: 81
97/04/03 19:30:05 | Using 7951 Store buckets, maintain 1 bucket every 10 seconds
97/04/03 19:30:05 | Rebuilding storage from disk image in /home2/lib/squid/cache
97/04/03 19:30:06 | Rebuilding in FAST MODE.
97/04/03 19:30:06 | Accepting HTTP connections on FD 20.
97/04/03 19:30:06 | Accepting ICP connections on FD 21.
97/04/03 19:30:06 | Ready to serve requests.
97/04/03 19:30:07 | Finished rebuilding storage from disk image.
97/04/03 19:30:07 | 654 Lines read from previous logfile.
97/04/03 19:30:07 | 654 Objects loaded.
97/04/03 19:30:07 | 0 Objects expired.
97/04/03 19:30:07 | 0 Duplicate URLs purged.
97/04/03 19:30:07 | 0 Swapfile clashes avoided.
97/04/03 19:30:07 | Took 1 seconds (654.0 objects/sec).
97/04/03 19:30:07 | store _ swap _ size = 7381k
97/04/03 19:30:22 | ERR _ DNS _ FAIL: http: // www.ief.kiev.ua/
97/04/03 19:38:01 | Preparing for shutdown after 18 connections
97/04/03 19:38:01 | Waiting 0 seconds for active connections to finish
97/04/03 19:38:03 | FD 20 Closing HTTP connection
97/04/03 19:38:03 | FD 21 Closing ICP connection
97/04/03 19:38:04 | Shutting down...
97/04/03 19:38:04 | storeWriteCleanLog: Starting...
97/04/03 19:38:04 | Finished. Wrote 653 lines.
97/04/03 19:38:04 | Took 0 seconds (653.0 lines/sec).
Memory usage for squid via mallinfo ():
         Total space in arena: 1700 KB
         Ordinary blocks: 1675 KB 304 blks
         Small blocks: 18 KB 1824 blks
         Holding blocks: 0 KB 57 blks
         Free Small blocks: 60 KB
         Free Ordinary blocks: 24 KB
         Total in use: 1694 KB 100 %
         Total free: 85 KB 5 %
97/04/03 19:38:04 | Squid Cache (Version 1.1.8): Exiting normally.

In what there can be a problem?
I shall be glad to any advice.

--
	Best rgds,		Dimitry