Wifi randomly disconnects from my macbook pro running 10.9.2.

Wifi randomly disconnects from my macbook pro running 10.9.2.  Rebooting is necessary to regain the wifi connection.  The wifi power indicator indicates a full connection, but the card sees no wifi networks. I have renamed the location, deleted and reinstalled the wifi interface, moved the wifi inerface to the top, and reset the DNS.  This problem is continual and occurs with all wifi spots.   Please help.

It seems that the wifi on the computer shuts off and will not turn on until the computer has been rebooted.  Can someone poease help?

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