First and probably only post but I want to get this info. out to the other WBR-1310 owners who struggle with this problem of maintaining connection for more than 15 minutes at a time. I stumbled upon this post:
telling me that I should flash the DI-524 Rev. D to my WBR-1310. GO TO D-LINK WEBSITE RIGHT NOW AND DOWNLOAD THE DI-524 REV. D LATEST FIRMWARE (4.03). Yes it is released earlier than the WBR-1310's latest firmware but who gives a f*** when it works! Then you need to log-on to your router (192.168.0.1 into a web broswer), go to TOOLS>>FIRMWARE>>click on browse and find the DI-524 Rev. D that you just downloaded. Then click save settings and you're done!
I will repost later on tonight about how my internet connection holds up (I will be absent from my computer but the wireless connection will [hopefully!] not be turned off)
Good luck + post similar results/findings!
11/09/09 EDIT: My WBR-1310 is the one that had version A1 for hardware, and thus (latest) version 1.04 for firmware. You'll see in some of the posts below people having problems with the "solution" I posted above and it is bc they have different hardware/firmware versions from my WBR-1310. Unfortunately I don't know what options out there are available to them- let's hope that there is something though!