How do you solve error code NP-3175-9 on ps4?

Error code NP-3175-9 on PS4 typically indicates a problem with connecting to the PlayStation Network. To resolve this, first check your internet connection and make sure it’s stable. You can also try restarting your router and the PS4 console. If the problem persists, consider changing your DNS settings to google's DNS (8.8.8.8 and 8.8.4.4) and ensure your system software is up to date.