With many users reporting issues playing various Call of Duty games and Destiny, the PlayStation Network Status Page has confirmed that there are PSN issues affect Gaming and Social on PlayStation 4 and PlayStation 3:
You may be experiencing issues related to launching certain games or game functionality. This is due to factors external to PSN. We are tracking the progress of the resolution of the issue.
Everything else is said to be up and running so you shouldn’t have any issues taking advantage of the Flash Sale in North America right now.
@beyblade2435 Please unplug your router for 3 minutes and restart the console, if the issue persist try using a wired connection.
— Ask PlayStation (@AskPlayStation) June 26, 2015
As a reminder, there will be some PSN maintenance on Monday/Tuesday for over an hour.
Have you been having troubles with the PSN today?
[Source: PSN Status Page]
PSN Issues Affecting PS4 & PS3 Games Are Due to "Factors External to PSN"