ok so i upgraded leopard on my macbook c2d. the internet connection works for like a day, then it doesnt, then it works, then it doesnt...

i have a ps3, wii, mac mini, and a dell laptop all on the network including a VOIP phones all working perfectly fine

after i upgraded to leopard the wireless just sucks now. please help!

i took it into the applestore for repair to replace the airport card also, same problems