WiFi, saying: any IP address

My 11 "MacBook Air is hard to connect to the Internet, whenever I put it to sleep or run it, it says"wifi has no IP address and cannot connect to the internet. I have to turn the wifi market and then wait for wifi access, even if I get wifi it's a problem I would like to get sorted in the end.

My Mac is running OSX Yosemite.

This is what is shown in the system preferences.

Tags: Notebooks

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