We are having a big problem on our network. We are a non-profit organization supporting about 30 users here running various children's tutoring programs, and today the network became completely unstable.
Here is the sitaution, all of a sudden the network slowed to a complete crawl. Internet connection went up and down, shared printers and file shares started disappearing, etc. We have a spare router and switch, so the first things we tried was swapping out a new router and switch and rebooting the DC. This didn't help.
For troubleshooting, one thing I've noticed is that if we plug the server straight into the router (bypass the switch) then it works just fine and wireless clients can connect. This leads me to believe the problem is in the switch connected computer someplace. Again, we tried changing the switch itself but that didn't help. If we boot up the router with just the server plugged into it, it works flawlessly and wireless clients are fine. THE MINUTE you connect the switch (24 port) into the router, everything goes nuts. The server and wireless clients begin to drop connections to the network, etc.
I've checked the event logs on the DC and it does show several events saying that the Domain Controller lost n election to be the master browser. It says it lost an election to FSERVER, which is itself!
I'm wondering if perhaps there is a malware infection on one of the machines that could do this, or a shorted out cat5 cable going into the switch or something? Can anyone provide any help?