wifi keeps failing on macbook pro

Hello there,

Just over the past few weeks my MBP is keep on losing WiFi connectivity. I have a constant ping running in the background on Terminal and when I notice web pages or email not responding I flip over and can see that the pings are failing. Now the other laptops I have in my office (Windows) are all working fine so there is no WiFi or broadband issues, the problem only exits here on my Mac. I run diagnostics and surprisingly enough it doesn't find anything but miraculously the WiFi starts working again - pings responding, however this is probably as drags has restarted the WiFi driver.

This is happening all the time and I cannot find any fix for this apart from running diags or turning off WiFi on the Mac and turning it back on again.

My hardware is MacBook Pro (Retina, 15-inch, Late 2013), running the latest 10.11.6 (15G31) release.

Any ideas would be great.