WiFi locked up

Had the first real OS freeze on the Cr-48 tonight. I had disabled the WiFi because I had lost the Internet connection, but the router was still up - so I wanted to force the Cr-48 to connect to 3G.  When I got the Internet back up on my network, I couldn't get the WiFi enabled again without rebooting the notebook. Pretty frustrating, but it was the first time I've had an issue like that.