This has been getting worse . First it started downstairs on just two stations , they would all of a sudden stop seeing the network (peer to peer still worked). Once a reinstall of the network on that station helped another time just a off and on ofthe switch did the trick . So now a workstation not on that switch but on our main network just all of a sudden stopped seeing the network for 1 day and then was back on. Every station is running nt4 with sp6.