Wifi disconnets when screen goes black

This issue occurs after the latest Mavericks update
When the screen gooes black after a few  minutues of no activity, the wifi disconnets.
This wasnt the issue before.
I tried to restart the mac, but it doesnt work.
Thanks
Stan

Hello Stanley22
Check out the article below to troubleshoot your issue of your Wi-Fi not maintaining a connection after going to sleep.
Wi-Fi: How to troubleshoot Wi-Fi connectivity
http://support.apple.com/kb/HT4628
Regards,
-Norm G.  

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