Sony’s official Playstation Twitter account broke the news that the PSN will be undergoing a short maintenance later this afternoon and some functions may be down for some users. 
 
The official word is this.

We are conducting PSN maintenance today from 8am-12pm Pacific Time. Some users may not be able to access some functions during this time

 
We will keep you updated if the window is updated or any specific problems arrive.
 
SOURCE | TWITTER