Wi-Fi fails to connect after OS X 10.10.2 Update I have a Mac Pro 4,1 that was just upgraded to OS X 10.10.2 (14C109).  I've used an ASUS PCE-AC68 wireless adaptor since Mavericks, and haven't had any problems before now.  I understand that this isn't exactly a supported configuration, but the card was plug-and-play since I first purchased it.

Since the OS X 10.10.2 update, the card regularly drops its connection to the router, and rarely is able to reconnect.  Running a command such as traceroute 192.168.1.1 to try to see if anything is happening between the computer and the router just yields timeout errors, although the System Preferences "Neworking" panel claims that the network is still connected.  Other devices have no problems connecting to the same network from the same location, including a MacBook Pro 10,1 running OS X 10.10.2.

Is there anybody encountering a similar problem or who might be able suggest ways to troubleshoot?  Thanks!
Downgrade driver back to version 7.0 from current 7.1 version. Follow the instructions here: https://discussions.apple.com/thread/6802848