When I first get in the office, my DInc connects to corp. wifi just fine. However, give it 15, 20 minutes, if I try to update anything via the 'net, say, the weather, it tells me I have no connection.
I'll look at the Wireless settings, and it'll show that it's authenticating. I turn off Wifi, then turn it back on, and it connects. 30 min later, its back to "Authenticating" again.