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.
'I've had the time of my life,' 42-year-old Metzen wrote in a heartfelt letter posted on the Battle.net forums.
The release of WoW's sixth expansion also led to a surge in concurrent players during the launch week.
EA's interruption came just hours after Blizzard Entertainment's servers were hit by yet another DDoS attack.
'Gaming servers are a top target of DDoS assaults,' Imperva security researcher Ofer Gayer told IBTimes UK.
Set in Stuttgart, Germany, the map will be the popular hero-based shooter's first free add-on map since launch.
Game also becomes fastest selling PC game ever in China.
The hacker group had claimed responsibility for the recent attack on Pokemon Go servers.
Use real-world currency to buy 90 collectable skins and items.
If convicted, Stephen Cebula could face up to five years in prison and a $250,000 fine.
'We are not going to earn a lot of money from it,' said Ubisoft's EMEA executive director.
Blizzard panel at SDCC will reveal more about character rumoured to be a healing sniper.
The latest teaser comes amid a flurry of fan theories and speculation about a new possible sniper named Sombra.
Fan notices uncanny similarity between hero's hello emote and Disney favourite's wave.
20-year-old Wu Hongyu died tragically in an accident just one day before the launch of Overwatch.
It isn't clear if the new project will be Diablo 4, a Diablo 3 expansion or an entirely new spinoff in the series.
Blizzard's ranked mode is live on PC and arrives in early July on consoles.
Game director Kaplan has said that the dwarf-like hero will be getting a significant downgrade next month.
Overwatch claimed top honours as the best-selling game on PC for May.
Two Overwatch pro players threatened to quit the game if she was found innocent.
"You can't arrest a lizard," AppleJ4ck told IBTimes UK.