My wifi will not work after compurter sleeps

Wifi works great until computer goes to sleep.  When I turn it back on, it can't connect.  Right now I am restarting the computer everytime.  Very annoying.  This only started this week.  It has worked well since Christmas.  This is an imac bought on Dec. 23 of this year.

This is a know issue. The work around solution is only letting the display sleep, set the options in System Preferences - Energy Saver - Power. If you don't want to use the work around then simply cycle the Wi-Fi when you wake up the computer. You can do this by click the Wi-Fi symbol in the menu and then choose Turn Wi-Fi Off and then Turn Wi-Fi on.
BTW PLEASE PLEASE PLEASE fill out your profile. Not having a profile completed makes it difficult for those trying to help you. You can do this by clicking Your Stuff in the upper right of this page, then click Profile and filling in the pertinent information.

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