Q: Wi-Fi Dropping intermittently

Since it's happening in different locations guessing it can't be a router issue.

Yes, most likely, it is with the MacBook Pro itself.

Try the following on your Mac in order, until (hopefully) resolved:

1. Create a New User Account
   • System Preferences > Accounts
   • Click "+" to add a new account.
   • Log off, and then, log back on with the new user account.
   • Try connecting to a Wi-Fi network with your Mac's AirPort.
   • If this resolves the problem, there may be something amiss with your current profile and will require further troubleshooting.
   • If this does not resolve the problem, go ahead and log back into your normal account and go on to the next step.
2. Delete AirPort Keychain Entries
   • Launch the "Keychain Access" application located in Applications/Utilities.
   • In the windows on the left side: Select login for Keychains and "Passwords" for Category.
   • Click on the "Kind" filter at the top, and look for any "AirPort network password" entries...and delete them.
   • Close Keychain Access.
3. Delete Preferred Network(s)
   • System Preferences > Network > Wi-Fi > Advanced > Wi-Fi tab
   • Delete all entries under "Preferred Networks."
   • Click on OK.
4. Add Preferred Network(s)
   • System Preferences > Network > Wi-Fi > Advanced > Wi-Fi tab
   • Add the preferred network(s) using the "+" button.
   • Click on OK.
   • Restart or log out, and then, back in.
     • If it works, then you are done.
     • If not, go on to the next step.
5. Move System Configuration Files
   1. Quit any applications that are currently using Wi-Fi.
   2. Turn off Wi-Fi from the Wi-Fi icon on the OS X menu bar.
   3. Open Finder > Go > Go To Folder > /Library/Preferences/SystemConfiguration/
   4. Locate and select the following files:
      Note: Files are OS X version specific, not all the following files are used in each version.
      • com.apple.airport.preferences.plist
      • com.apple.network.eapolclient.configuration.plist
      • com.apple.wifi.message-tracer.plist
      • NetworkInterfaces.plist
      • preferences.plist
   5. Move any matching files to the OS X Desktop. You can place them all in a folder as a backup. The "missing" files will be rebuilt after restarting the Mac.
   6. Reboot the Mac.
   7. Re-enable Wi-Fi from the Wi-Fi icon on the OS X menu bar.

You need to type in: /Library/Preferences/SystemConfiguration/, and then, click on Go.

When entering that search string into the Go to the folder window and clicking on Go you should now have an new Finder window with the SystemConfiguration folder opened.

From there you would locate the files that I indicated earlier so that you can move them to your desktop.

Typically your web browser (Safari, Chrome, etc.) should be closed.