Today I was disconnected again by this reason: https://support.steampowered.com/kb_article.php?ref=2117-ILZV-2837 and can't connect back anymore (tips in this article doesn't helped). Thas was after playing ~18 of 30 rounds.
I have installed new version of windows 10 x64 version 1607 os build 14393.576.
Yes I run 360 total security, tryed disable it - same result.
No, i don't use beta steam.
Steam was closed before I run ccleaner.