I recently reinstalled MAC OS X on my unibody MBP. I've installed all the updates and it's been working fine until now. When it goes to sleep automatically I press a key and it wakes up then the Airport icon in the bar at the top of the desktop stays greyed out. I have to go in and manually connect to my router each time the machine wakes from sleep. I don't know what the problem is. Any help would be appreciated.