printing problem

1. Printer is share in work group LAN.From other machine when printer is connecting its work but after 4-5 hours later the printer was disconnected and it can’t work.At that time,printer are connected in which machine at that machine,disable the LAN then enable or restart the machine,then its work.Please suggest the solution.In this machine Quick Heal license antivirus install.Operating system XP-SP2 installed in all machine.