Any guess will be just a guess. Let's check a few things.
1. Read http://forums.cnet.com/7723-13973_102-560420/wifi-disconnects-from-time-to-time-galaxy-tab-7-plus/?tag=contentBody;threadListing
It was the channel it was set to.
2. My new laptop was slow. The maker had shipped an old driver and the new driver was at their web site. That helped.
It's a shame you ruled out the router. I can cause slow wifi with many settings on the router.
My wireless connection is very slow (<1mbs). I have a linksys e1200 router currently and have tried it the connection out with a different linksys router as well so I don't believe it is the router. When I connect the computer to the router with a ethernet cord the speed is great (>26mbs). I don't know what this could be. I have powered off all the devices (modem, router, computer) but still get same result. Any ideas? Could it be the modem? I have Comcast as a provider and an RCA modem (model: DCM425).
Thanks in advance.