I have a WRT54GL v1.1 wireless router and a WUSB54G v4 wireless adapter, both made by Linksys. The router is in the living room by the TV and the my computer is in the bedroom. My ISP is Brighthouse.

    Operating System
        Microsoft Windows 7 Home Premium 64-bit SP1
    CPU
        Intel Core 2 Duo E6600 @ 2.40GHz    36 °C
        Conroe 65nm Technology
    RAM
        3.00GB Single-Channel DDR2 @ 333MHz (5-4-4-14)
    Motherboard
        eMachines EMCP73VT-PM (CPU 1)   26 °C
    Graphics
        ASUS VS247 (1920x1080@60Hz)
        767MB GeForce GTX 460 (nVidia)  43 °C
    Hard Drives
        466GB Seagate ST350041 8AS SCSI Disk Device (SATA)  35 °C
    Optical Drives
        HL-DT-ST DVDRAM GH41N SCSI CdRom Device
    Audio
        High Definition Audio Device

The problem is that my Internet connection will work fine for 15 minutes or so. Then the data will just stop flowing. Windows says I am still connected, and the systray icon still shows five bars. But Comodo Firewall will stop showing up and down traffic, and another of my systray applications complains about a lack of connection.

What I usually do is either disconnect from the network manually, or unplug and re-plug the USB adapter. At which point the connection will work properly for another 15 minutes. I've tried unplugging my router for 30 seconds and letting it reboot. I've also tried looking for a newer driver for my adapter but I seem to have the latest version 3.1.3.0.

This is a recent problem starting about a week ago. For the previous several months things were working just fine. I haven't made any changes to my system that I am aware of. The only thing I did was open my case to blow the dust out of it, then put everything back together.

How do I fix this issue?