rMBP 13" 2015 Internet connection problems

Every 5-10 seconds my internet connection drops for like a second - this problem occurs on every single Wi-Fi/router.

After I delete all files under /Library/Preferences/SystemConfiguration (resetting the Wi-Fi adapter) It works for half an hour, then it starts doing this again.

Is there any solution to this?

It works normally when in BootCamp Windows 10, it just won't work in OSX.

The worst part is that me and my girl maintain most of the contact through skype and when it drops connection (even if its for a second), skype decreases the call quality and before the normal quality is established again, the connection drops and therefore the quality and Im caught in an endless loophole of impossible communication...

Thank you in advance