In April, Blizzard shut down the popular 'vanilla' WoW server Nostalrius, triggering a fierce backlash.
'An underdog studio taking big risks to do something novel has powerful appeal,' the firm wrote.
The company explains that there has been some 'occasional confusion and inefficiencies' over the years.
The latest interruption follows a week of technical issues with the developer's servers.
The release of WoW's sixth expansion also led to a surge in concurrent players during the launch week.
The video game dev has been hit with multiple DDoS attacks in the past two months.
'Gaming servers are a top target of DDoS assaults,' Imperva security researcher Ofer Gayer told IBTimes UK.
The hacker group had claimed responsibility for the recent attack on Pokemon Go servers.
20-year-old Wu Hongyu died tragically in an accident just one day before the launch of Overwatch.
Gear controller by amputee engineering student hopes to help upper-limb amputees stomp the opposition.
"You can't arrest a lizard," AppleJ4ck told IBTimes UK.
Microsoft and Mojang have confirmed plans to create a version of the game tailored for the Chinese market.
Blizzard is also giving out free transmogrification to gamers who log in between 25 May and 1 August
"It's exceptionally rare that everyone wants the same thing," said assistant game director Ion "Watcher" Hazzikostas.
Activision says Call of Duty is setting new records for in-game content or DLC sales.
The announcement comes weeks after the game's developer swooped in with a cease-and-desist order forcing its closure.
The latest trailer for this summer's big-screen adaptation offers a glimpse of the famous Lion's Pride Inn.
Overwatch is the studio's first real venture into the FPS genre and its first simultaneous launch across PC and consoles.
The digital card game hit the milestone just ahead of the launch of its third full-sized expansion, Whispers of the Old Gods.
Fans may just get a classic server with Blizzard indicating possible collaboration with Nostalrius developers.
The project was officially announced in December 2010 and remained under wraps before it was ultimately cancelled in September 2014.
MMO's sixth major expansion arrives in the summer.
