Hi, I have a MacBook. It seems that I'll lose the internet from time to time even-though the airport has full bars? It seems like I can make this happen if I'm on the internet and I put the computer to sleep? When I wake it up and try to get onto the internet, it says that there's no internet connection, while the airport has full bars? Sometimes I can get a signal again if I restart my computer, but not always. Then I have to shut down the computer for a solid amount of time, and even then not always able to get the internet connection? I know it's not the internet signal itself because we have 2 other computers that get uninterrupted internet, while the MacBook isn't working? Thanks!