wireless internet

Hey guys. I am having a problem with my wireless internet connection. SWbell is my ISP and i run 2 apple computers on wireless internet. my modem is connected to the wall and i have an ethernet cable going to an apple airport which sends the internet wirelessly to both computers. The problem is that every 10 minutes or so, both computers simultaneously disconnect and drop internet for a good 5 minutes before its back up. how do i fix it?!