In an update on Twitter, Sony said that it was "aware some users are experiencing issues logging into PSN on PS4 due to the heavy traffic we are receiving, we're investigating."
The platform holder followed up the tweet by thanking users for their patience.
Sony announced yesterday that it would be temporarily disabling two of PS4's PlayStation Network features – What's New and the Content Information Screen – to help the service keep up with demand.
It isn't clear how many users are affected or when the service will be up and running as normal.
GameZone writes, "Sony's eagerly awaited PlayStation Network sale, which should discount a number of digital games for PS3 and PS Vita, should be announced tomorrow."
An Redditor just reported that he was banned on PlayStation Network for 24 hours because he drawed and uploaded an inappropriate picture on a squirrel in Tearaway.
A number of services on PlayStation Network will be turned off to ensure a smooth launch for PlayStation 4 in Europe, it was announced in an update on the European PlayStation blog.
