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PC?s suddenly losing connection to the router.

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PC?s suddenly losing connection to the router.

hollywoodmi
I manage a network w/ approx. 60 PC's. I'm using a Netopia 3347W-ENT router connected to an ADSL conn. 3.0/768. The rtr. is also handling DHCP and has only 1 subnet on it. I have a fiber link & transceiver between the floors connecting to different switches/hubs, Cisco, 3Com & Netgear. Everything has been running fine for a few years up until now. What?s happening is all of a sudden PC?s are losing their connection to the rtr. They can talk to other PC?s on the network just not the rtr. which means no Internet. It?s seems like it?s moving from PC to PC. Once one starts working again, a different one goes down. If?s it?s first thing in the morning that means that PC does not get DHCP info. It doesn?t matter if I statically code that PC or not. Nothing to my knowledge has change in the past few weeks. It?s very frustrating; Please Help! Any advice is appreciated. Thanks!