It is your Internet causing the store not to load try shutting your network equipment down for a few minutes, failing that setup a DMZ or open the firewall ports PSN uses.
community.eu.playstation.com/t5/Gaming-Network-Support/How-to-put-your-PS3-or-PS4-into-a-DMZ/td-p/10655314
When you cannot connect to PlayStation™Network
Use PlayStation™Network to connect your PS4™ system to a PlayStation™Network server or to another PS4™ system. When you're using PlayStation™Network at an office or other location with a shared network, a firewall or other security measures might prevent your PS4™ system from connecting to PlayStation™Network. If this occurs, refer to the port numbers listed below, which are used when you connect your PS4™ system to a PlayStation™Network server.
- TCP: 80, 443, 3478, 3479, 3480
- UDP: 3478, 3479
For online activities such as competing with other players while your system is connected directly to other PS4™ systems, a different port number is used each time you connect.
Some routers depending on when they were released may not work even with the above fixes, usually router's released over 5 years ago or VM's original Superhub really want replacing with an upgrade.