A decade has been long enough. And patience is wearing thin for anxious Diablo players.

Facing with an increasing number of complaints by South Korea's online gamers, Korea Fair Trade Commission on Tuesday said it launched an investigation into the Seoul office of Blizzard Entertainment – the U.S. maker of the blockbuster Diablo online computer games – to see if the company violated South Korea's electronic commerce law.

The reason: so many people want to play the new version of Diablo, called Diablo III, that computer servers and networks cannot handle the traffic.

Since the simultaneous global launch of Diablo 3 on May 15, Korean gamers have been whining about a server crush caused by too much simultaneous traffic. In the U.S., gamers have also complained about getting thrown off the network in the middle of a game. On Amazon.com, reviewers have savaged Blizzard for requiring that gamers be logged on to the Internet to play Diablo III.

Some Korean gamers sought a refund, but the company's policy doesn't allow a refund once the product is already in use. South Korea's relevant law guarantees a refund within seven days of purchase if the problem with the product is not caused by a consumer.