After restarting my Mac does not connect wifi preferred

Hi Everyone!
My Mac Air does not automatically connect to desired Wi-Fi network.
I have already done:
1- I Checked my TCP/IP settings in the Network ( I did Renew DHCP lease).
2- I Removed networks from my Preferred Networks list.
3 - I Removed my stored network passwords.
4 - Restarted
5 - Joined again.
But after... When waking from sleep does not connect..
Could you help me.
Many thanks guys

there is no one fix solution to wifi problems, your issue is nothing new please refer to this link
if you haven't read it ,
https://discussions.apple.com/message/24691862#24691862

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After restarting my Mac does not connect wifi preferred

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