Internet And Email Time Out Serveral Times Per Day

We have a bizarre issue on our network! Several times a day connections to the Web Drop.
Even their email will hang in their Outbox. I checked everything  I know. All I can thing its a bad switch somewhere??
 We have a Windows network with 2012 to 2008 servers running. It is getting worse!
I am currently replacing the Switches. Any ideas?
jackm1Asked:
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AkinsdNetwork AdministratorCommented:
Is this happening to everyone or multiple users all at the same time? Is happening at particular times of the day?
Most logical cause would be congestion which could cause collisions.
I would recommend determining a pattern and isolating the problem rather.
Monitor the uplink of the switch for traffic with the show interface xx command. Take a look and the txload and the rxload values.
You can also configure port monitoring in conjunction with Wireshark.

I wouldn't rule out DNS either just in case - DDoS attack is a possibility also. Check the txload and rxload on the switchport your DNS server connects to

All the best
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Sid6_7Commented:
I agree with Akinsd. Should implement wireshark near your gateway and see what is going on. Speaking of attacks, it could also be a notebook or computer that is infected and when joined cause havoc on the network.
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jackm1Author Commented:
This happens all through out the day, even on the weekend when most workstations are shutdown. I don't have much experience with Wire shark.
Should, I put in on the mail Server where most of the issue is happening?
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AkinsdNetwork AdministratorCommented:
The default settings of Wireshark will suffice for your troubleshooting. It's configured to capture all traffic around the computer running it.

There's a possible hardware defect
- Start with the DNS server (the switch it's connected to) and check the logs.
- You can also try monitoring tools like opmanager (10 free licenses), the dude (100% free) etc
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