TP-Link TL-WDN4800 Connection quality drops soon after booting

OS = Windows 7 Ultimate 64bit

Alright, got a problem that occurred all of a sudden, with no change in my computer having been made at all.

After turning off my computer for the night, then turning it on the next day, my connection was fine for the first minute of internet browsing. After that minute, however, my connection grinds to dial-up-like speeds and the wireless symbol on my toolbar goes from 4 bars, to 2 (out of a maximum of 5).

And I've tested this too. SpeedTest, when ran before the connection goes sucky, shows me I'm getting 10Mb/s downloads and 14Mb/s uploads with a 34ms ping.
Once the connection goes sucky, I get 4Mb/s downloads and 7MB/s uploads with a 74 ping.
Doesn't feel like I'm getting anywhere near 4mb/s though; sites take half a minute to load and a three minute youtube video takes over half an hour to buffer @ 720p.

I've tried re-installing my wireless driver, updating my wireless driver, fiddling with the antennae on my wifi-card, running various CMD commands (And yes, I know exactly what they do. I didn't do anything that could be remotely damaging to my computer) and running the troubleshooter a bazillion times.

Not the slightest difference has been made to my problem.

At this point, to me, it sounds like a format. Something I'd MUCH rather avoid doing. Don't want to re-find and re-install 500GB worth of programs and games.

Anyone have any ideas? I'm all out.

Thanks in advance.
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More about link wdn4800 connection quality drops booting
  1. Do you get better performance if you temporarily connect your computer to the router with an ethernet cable? Or if you connect the computer directly to the modem with an ethernet cable?
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