IPhone 4S Wi-Fi malfunctioning!

I recently noticed that my wireless connection quality is poor.
I have to be within 15 feet of my router to get a usable connection, any further and it will automatically disconnect. My network will still appear, but the "Unable to connect to" error pops up if I'm out of my very poor range.
I restarted my router, to no avail--other devices connected fine.
I reset network settings, to no avail.
I looked online and saw that people found a certain screw tended to be loose, opened my iPhone, saw my screw was snug, so no luck there either.
What do I do?

Hello WILLYumD,
The following article provides information and troubleshooting that can help stabilize your iPhone's WiFi connection.
iOS: Troubleshooting Wi-Fi networks and connections
http://support.apple.com/kb/TS1398
Cheers,
Allen

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