I'm having this odd problem where maybe 1/10 times I put my 2010 Macbook Air 13" to sleep I can't access the internet upon wake up. The Airport menu item continues to be full bars, and as far as I can tell everything looks normal inside the Network Preferences (I have an IP address, etc.). My girlfriend's laptop, sitting right next to me, continues to work so it's not the internet. I've tried clicking "renew dhcp" in Network Prefs, turning Airport off and back on, zapping PRAM, and repairing permissions. The only fix I've found is rebooting the computer. Anyone have this happening to them or have any other ideas of what I could try?