Sony's online PlayStation store was inaccessible to users for part of Monday in the latest possible cyberattack on the electronics and entertainment company.
Sony Computer Entertainment in Tokyo said Monday the problem lasted two hours but has been fixed globally. It said the cause is under investigation, but there is no sign of any material being stolen.
Last week, the computer systems of Sony Pictures Entertainment were disrupted by a cyberattack and confidential information including unreleased movies was leaked on the Internet.
North Korea was among the suspects, but it has denied responsibility.
The FBI is investigating threatening emails sent to some employees of Sony Pictures Entertainment, and trying to identify the person or group responsible.
There was no indication of a link between the PlayStation and Sony Pictures incidents.