Mac book air connects to internet w/ lag and drops

my macbook air has been working for the past year, but recently my internet has been lagging and disconnecting by itself every 30 seconds. all my computers connect through a router and modem but only the mac air is having internet problems. it keeps saying "the page cannot be displayed" even though airport shows that it is connected to the internet. (note: the mac air works flawlessly when I connect to other wifi locations outside of home)
router: netgear
all the things I've tried.
-editing keychain settings
-deleting my network and creating a new one
-resetting modem and router
-resetting airport
-changing dns and ip settings
-resetting the mac air
-turning off bluetooth
-changing browser settings
-smashing the router around
nothing has worked....
p.s. there was one day where I changed my router and it worked for one day, the next day it didn't work again.

What are your wireless encryption settings? WEP, WPA2? Have you tried it with no encryption? Was it faster? Sometimes if you have rearranged the room or moved the router, interference can start. I also would download istumbler and see if you have neighbors using the same or adjacent channels. It will also show you the noise on your Netgear. Maybe this will bring some ideas to you:
http://support.apple.com/kb/TS1809

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