Sudden Change in WiFi Coverage

Hi,
Within last 10 days one of my bedrooms (farthest from the router) has almost lost the signal. All devices can see the network, but the signal is so weak that it is useless. Why would a once-great signal just weaken suddenly?
Thank you

I point to http://forums.verizon.com/t5/FiOS-Internet/Why-your-Wi-Fi-is-slow/td-p/534451
which I think, should help..
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