Please help!! why doesn't my macbook automatically connect to my wireless router??

it use to automatically connect. this problem started about 2 weeks ago. everytime i wake it up, it searches for a while and fails. i have to do a diagnostic everytime to make it connect. i even changed my SSID to something original because i heard it would help, but the problem still occurs

Danny ..
everytime i wake it up, it searches for a while and fails
See;  Symptom: The network connection drops unexpectedly >  Wi-Fi: How to troubleshoot Wi-Fi connectivity

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