You can check this one: Disconnected from WoW all day, WinMTR logs included - #2 by Кеттарол-howling-fjord
There’s a problem connecting 185.60.114.159 (one of battle.net IPs). For me, at least. There’re routing problem on one of blizzard nodes after cn-lgpy1-ia-bons-02.as57976 hop.
There are also traceroutes from other ppl with the same tendency