Sony did not offer any real response as to what happened, and a few groups were quick to take credit for the downtime but none seems credible.
For most of the day, Sony's site had the brief message: "We are currently under maintenance and you may be experiencing issues. We appreciate your patience." The maintenance was certainly not announced ahead of time (which is very unlike Sony), so the 'maintenance' was likely to fix whatever broke PSN.
Hopefully, we will know more as to what happened with an update from Sony later today or tomorrow.
Written by: Andre Yoskowitz @ 4 Jan 2016 23:13