Had the same problem, so I downgraded to 184.108.40.206 as well. works fine! It's not entirely 220.127.116.11's problem though. I've read so many threads in many forums, and 18.104.22.168 works for some people, and not for others. It must be some compatibility issue with the hardware, is my guess.
In any case, if 5.1 no longer works for you, downgrade to 4.6 (don't downgrade to any other version 5 because you might have the same problem).