When iMac wakes my wifi won't connect, and nothing else works.

Since updating to Mtn Lion on my iMac, when my computer has been hibernating for a while (a few hours+) when I wake it, it attempts to connect to wifi, and never actually does.  While this occurs, I can't open any program, application, even Activity Monitor to "force" the task to end or anything.  My only solution has been to manually shut off and re-boot the machine.
Anyone else having these issues?  Once I reboot, everything is fine - it automatically logs into the wifi and programs start instantly.  It's as if there's a hang up that's preventing anything else from happening.
No issues with my macbook pro

Use the ( - ) button to delete the wireless network settings you currently have configured, and restart the computer. Go ahead and reconnect to your network, and hibernate. See when it comes out of it, if it's resolved. Or wait awhile
-Dac

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