Try rolling it back to 802.11g and changing the channel.
My problem is apparently common: When I run my microwave oven (a few feet away, on the other side of my bedroom's wall), I get thrown off the Internet. This problem was addressed on the forum in 2006....The poster was advised to (1) move either the router, microwave, or computer to a different location; or (2)"use a different wireless broadcast channel."
I'm not in a position to move anything around. I'm not very computer savvy: WHAT DOES "use a different wireless broadcast channel" MEAN?
Note: My router (in my apartment's living room) is an inexpensive TP-LINK (brand) 150Mbps wireless N router...based on 802.11n technology (the box says).
On the rear side it has 4 LAN ports and 1 WAN port. It works fine in my 1-bedroom apt. (except for the microwave disruption). My computer is a Mac Mini.
If I need to buy a fancier router, I will (if it's not expensive).