Solution 1. Check for System Software Update

PS4 error NW-31294-9 may be caused by a new System Software Update.  To check for updates, go to settings and look for System Software Update.

Option 1. System Software Update

If no update was found, double check it by accessing Safe Mode and check the Update System Software. To do these steps below are provided.

Option 2. Update using Safe mode

Step 1. Safe Mode
A YouTube tutorial is also provided here.

Step 2. Select Update System Software

If no update was found, or the error persists after the update, the problem could be with your network setting. Please see Solution 2.

Option 3. Manual update

Solution 2. Check your Home Network Setting

PS4 error NW-31294-9 may be caused by your home network setting or your WiFi module. To test it, please see below.

1. Switch off the modem router and PlayStation 4 and unplug from the outlet for a minimum of one minute before turning on both devices.
2. Check your internet speed if it is normal by accessing this website speedtest.net using your phone or PC. Contact your internet service provider if the internet is experiencing slow connection. Otherwise, proceed below.
3. Check your WiFi signal if your PlayStation 4 is getting enough of it. Using cable might help to prevent PS4 error NW-31294-9.
4. Avoid using switch or router and directly connect to the modem if possible.
5. If not, configure the router, using the video tutorial here on YouTube.
6. Check if someone in your home network is using too much bandwidth. Let them finish, then try again.
7. Try to Rebuild Database or Initialize PS4, but if the error persists, please bring your PS4 to an authorized service center, or use a wired connection

To Rebuild Database or Initialize PS4, access safe mode. To access Safe Mode, please refer to Solution 1.