WRT54GS extremely slow, drops connection

Hi all, 
I have a WRT54GS model 2.0 with speedbooster. It has firmware version v4.71.4. It's worked absolutely fine for 4 years, but recently it has been having an extremely slow connection, if it connects at all. I continually get network time out errors, but it never seems to go away. 
I have reset the modem and router many times, it works fine for a few minutes, and then slows down to its problematic pace. When connecting directly to the modem I get speeds up to 18 mbps, but when using the router I seem to top out around 6-7 mbps. 
The main problem I'm having is trying to connect to Xbox live, with the problem seeming to be an insufficient MTU setting, even though I have it manually set to 1452 with the 53-3074 ports open. I have set a static IP for the xbox, with the router's DNS settings and subnet masks. I have tried everything this forum has suggested, but I can't seem to get my old speeds back. 
Is there anything anyone can do to steer me right? 
Thanks, 
Chris

Try to upgrade / re flash the firmware on your Linksys router .
Connect a computer with the Ethernet cable to the Ethernet port on your router .
Download the latest firmware from the Linksys website .
Open the setup page of the router .
Go to the Administration tab and click on the sub tab Firmware Upgrade .
Browse and Select the downloaded firmware file and do the upgrade .
After upgrading the firmware reset the router .
Press and hold the reset button for 30 seconds .
Power cycle the modem and router .
Open the setup page of your Linksys router and configure it manually .
Keep the MTU Size to 1365 .
Also under the Security tab uncheck the Block anonymous Internet Request .
Also disable the UpNp under the router Administration tab .
See if that helps you .

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