Macbook randomly disconnects from WI-FI, have to run diagnostics every time to restore

Ever since I got a new router I'm having problem with my internet connection. Everytime I close my Macbook, I can't connect via wi-fi. The network is still there, and the symbol shows that I'm connected, but there's no data. What I typically do in this situation is run the Diagnostics, and it fixes the issue, but I need a more permanent solution. Is there something in settings I'm overlooking?
Thanks in advance.

I found this on a different Forum which you could always try:
https://discussions.apple.com/thread/1352518?start=885&tstart=0
1. Open network preferences from your WiFi icon in the menu bar. Then click advanced. Delete the network that is giving you problems.
2. Open Keychain in the utilities folder of your hard drive. Find the passwords that are stored for your particular network and delete them. There may be multiple passwords for your network, so search carefully.
3. Repair permissions using the disk utility.
4. Reboot the computer.
5. Reenter your network data to log into the network.

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Boot to the Recovery HD: Restart the computer and after the chime press and hold down the COMMAND and R keys until the menu screen appears. Alternatively, restart the computer and after the chime press and hold down the OPTION key until the boot manager screen appears. Select the Recovery HD and click on the downward pointing arrow button.
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1c. Add Preferred Network(s)
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Macbook randomly disconnects from WI-FI, have to run diagnostics every time to restore

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