Intermittent connection problems

I'm having intermittent connection problems. Cox cable is the ISP. Account is setup with premium service, which should be 8mb down and 1mb up I believe. Speed tests show 800kb down and 500mb up. Usually on Fridays and Saturdays ping times range from 500ms to 3000ms, which should not be above 75ms. There are only 174 modems on my node which has a max capacity of 500 modems. We have tried new modems, new routers, new cables. We had a new coax line ran from the box outside directly to the modem and a new drop line from the pole to the house. I currently use a linksys wrt 54g router. I flashed the firmware to dd-wrt to amplify the wireless signal to 200mw. I've had the same problems with the factory firmware, and a brand new belkin wireless n router. My neighbor also has cox on an unsecured wireless router with default logins, which is how I know they also have cox. When I have the connection problems so does my neighbor. The last time a cox technician came to my house he blamed the issue on my router after presented with all this info which is why I bought the new belkin that didn't fix the problem.  Cox is coming to the house again on Saturday, I firmly believe the issue is on their side. What else can I try on my own to help prove this to the next technician?
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SappbrostsAsked:
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Hypercat (Deb)Connect With a Mentor Commented:
Take a look at PingPlotter (freeware).  It might be helpful.
http://www.pingplotter.com/ 
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SappbrostsAuthor Commented:
edit: speedtests show 800kb down and 500kb up :p not mb
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Hypercat (Deb)Commented:
Do you have a computer at your house that you can hook up using a wired NIC rather than wireless?  If you could do this and hook it up directly to their cable modem, bypassing your router entirely, that should satisfy the cable guys that there is nothing wrong with your router that is causing the problem.  Also, have you had them check your internal wiring?
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SappbrostsAuthor Commented:
I have screenshots of ping times and tracerts taken during the connection issues when the pc was connected directly to the modem.  Its almost impossible to get a tech here while the issue is actually occurring because it is intermittent and after calling the ISP it takes about 2 days to get a tech here and the connection is back to normal once they arrive.

Does anyone know of a free app that will monitor and log the connetion speeds or something similar?
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SappbrostsAuthor Commented:
Ok, so I guess this is going to be a two or three part question, i'm bumping the point value to 500.  I've found the cause of my extremely bad connection, my girlfriends two teenage boys downloading crap on their PCs.  One of them is using Utorrent.  
so here are the two questions:
1. How can I limit the amount of bandwidth available to each one of them so it does not ruin my connection?  Would I do this with QoS, and how?
2. How can I block Utorrent from having network access using my linksys wrt54g router?
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