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Help! Sudden poor performance

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Hello,

Recently I have experienced a massive drop in performance on my WLAN. Performance is fine on the Gigabit LAN.

After performing basic troubleshooting on my Netgear WNR3500L (different computers, settings) I had decided that it had burnt out after 2 years. So, I bought another one since it had been great.

Well...the performance woes continue. Bandwith is pathetic - 300kbit/sec or less, with full signal right next to the router. My suspicion is that there is heavy interference suddenly as I live in a townhouse.

I even tried different operating systems on the routers (Stock, DD-WRT, and Tomato) to no avail. All my PCs and smartphones have the same issue. I also changed every setting possible - no change.

Here is a screenshot showing all the networks in my area (C&P Telephone is mine)
http://i.imgur.com/FWsGl9N.png

Any help would be greatly appreciated.

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