Every time I close my Macbook Air and then go to use it again. My wifi is not connected, I have to go to the network diagnostics and basically find my network and reconnect every time. Is there anything I can do to fix this?

Every time I close my Macbook Air and then go to use it again. My wifi is not connected, I have to go to the network diagnostics and basically find my network and reconnect every time. Is there anything I can do to fix this?

worksafe's link with the KeyChain fix is good.
This usually happens when KeyChain has two entries for the same WiFi network.
If repair did not work you can follow the manual steps:
Disconnect WiFi
Open KeyChain from Applications / Utilities and find your WiFi network entry(ies) and delete all of them.
Connect to your WiFi again.

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