I changed my old TP-Link router to a new ASUS RT-AC51U. After that I get randomly DCs, sometimes it can work for a full day, but regulary it drops out in every 5-20 mins. After the DC the client try to rebuild connection, but it fails every time till TS3 restart.
I did try more than 5 servers but I have no idea what cause it. The fix point is it came with the router change.

Thanks for the answers!