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Slow Internet

We have Cable Internet Service (15mb Down/2mb Up) and 15 workstations with SBS2011 as DC / DNS / DHCP. All workstaions receive IP / DNS/ Gateway Information from DHCP server.
From time to time, when I visit CNN.COM (for example, but it happens to any site), it shows text overlapping each other with no images.

I have to click the Refresh button several times to display a complete page.
It does not happen all day. It is just intermittant and that is what is driving me crazy because it is difficult to pin-point the source of the problem.

We have several static IP addresses, so I connected the ethernet cable from ISP's Cable Modem to a switch. From the switch, one ethernet cable goes to a single computer with a public IP address and another ethernet cable goes to my CISCO 1801 router.
All 15 workstations and a few servers are all connected to CISCO 1801 router. My CISCO does NAT, Port Forwarding ... etc.

Today when I realized that I had to click several times to display a web page like CNN, I quickly connected to that PC (with static public IP) and there was NO PROBLEM in surfing the same web page. But my workstation continued to fail to display the website. I tried Foxnews.com on mine and I had to refresh the screen several times, but that public IP assigned PC displayed a complete page every time without having to press Refresh button.

So I concluded that there is something wrong with the CISCO router or something on the network is causing the delay in browing the internet. But the difficulty is that 95 percent of time people don't have the problem.

I have reset my CISCO router many times to know that resetting CISCO 1801 did not solve the problem. I am at a loss. Where do I go from here?

1 Solution
Cliff GaliherCommented:
You are at a place where guessing does no good. Use something like httpwatch to SEE what requests are occurring, what times they are taking, and what errors are being returned. That is at least a start.
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