PSN will be undergo Maintenance on Monday, October 15th from 4AM to 4PM Pacific Time (7AM to 7PM Eastern). You can view Sony statement down below:
We wanted to reach out to you in order to let you all know that there is a planned maintenance for the PlayStation Network scheduled for Monday, October 15th from 4AM to 4PM Pacific Time (7AM to 7PM Eastern).
If you’ve signed onto PSN over the past few days, you’ll still be able to play online and access apps during this period, but you may receive a maintenance notification when attempting to access the PlayStation Store, PlayStation Home, and Account Management as these services will be unavailable. Be sure to sign in now if you wish to access the Network during this maintenance window.
Thanks for your patience during this maintenance timeframe, and we apologize for any inconvenience this may cause.