MacBook Air connects to WiFi but can't connect to internet for about 5 minutes

I have a MacBook Air running Yosemite and whenever I wake it from sleep or turn it on it says it's connected to wifi, but it's usually about 5 minutes before anything will load.
• Happens on multiple wifi networks
     • and doesn't happen to other devices on those networks
• Been going on for ages (since Mavericks)
• Diagnostics says nothing's wrong
• Still happens on other users and in safe mode.
Does this happen to anyone else / does anybody know a way around it?

Hi jamang1999,
For that specific issues where you are connected to the internet after waking your MacBook Air up from sleep and it is not connecting to the internet, then take a look at the article below to troubleshoot the issue further. There is a section called Symptom: After restarting or waking from sleep, my computer might not connect to the Internet and go through those troubleshooting steps to see if it continues afterwards. I know that the troubleshooting is for OS X lion and previous version of OS X but the troubleshooting is still relevant. If it does not work and are still experiencing issues, then you may need to contact Apple for additional support. 
Wi-Fi: How to troubleshoot Wi-Fi connectivity
https://support.apple.com/en-us/HT202222
Take it easy,
-Norm G.  

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