PC Disconnects from Novell

Have a pc that if it sits idle for 15 minutes or so it will disconnect from the Novell server. Re-logging in works 50% of the time. If doesn’t work, re-boot system. There are days when I may re-boot this pc (MINE) 5-6 times. Using Novell client 3.30.0.0 on a Windows 98 Second Edition OS. Any suggestions?