I have a savin clp 128 color printer that is networked. It has worked fine for 5 years. Now, it loses connection from the network. I can ping the printer ip and then about a half hour later it can't be pinged. When I turn the power off and on everything works and then about half hour or more later it stops communicating. The guy from the company we bought it from came and hooked up a laptop to it and updated the firmware and said he was able to continually ping the network card. He could not find the problem. Any ideas?