Restart the PS4 and the Wireless Router
The very first thing that you need to do is try restarting the devices. It is a very simple step and can help in fixing issues related to the wireless network.
So, if the PS4 is experiencing trouble in connecting to the network then you must, first of all, try restarting the device and then see if this can be helpful. There are chances that it can help in fixing wireless network related issues.
You can also try to restart the wireless router to resolve the problem. Also, observe the indicator lights on the wireless device. If indicator lights are blinking it means a connection is weak or poor. However, if the wi-fi network is unable to connect then you should get help from the technical expert team to resolve if PS4 Not Connecting to WiFi.