Hello,
I have the same problem every 3-4 minutes.
2 weeks ago I have bought new Lenovo y510, installed windows 8.1 and the problems occur right from the start (please note a first time fresh install was made). I have tried with different wifi drivers and with lan connection (same network) but gaming was impossible.
I have written in game bug alert but I haven’t received any support yet.
I have done all the prescriptions you have said to be done in other posts such as – disable all non Microsoft processes.
So 3 days ago I changed to windows 7, but again the same disconnection and error. I hope someone from the admins will read and help finally. Please note on my old PC I haven’t got any problems (same network, speed ~80 mb).