why is there no fix to this irritating loss of wi-fi I have been having on my macbook?

I have been losing wifi constantly for the past few weeks and have tried everything from changing setting on macbook to changing everything on the router as well. The problem still happens. Loses wifi. I know it is the machine as my ipad and other wireless devies all run just fine. Only the macbook is doing this. My sister across the country has the exact same issues with her macbook pro. The only fix for about a few minutes is turning off airport then turning back on. This is very annoying and thinking about getting a pc soon just so I can actually get work done. I have searched and read forums and seems like this is a very common problem that apple just isn't doing anything about or even aknowledging at all...