If you have original PS4 then it only connect to the 2.4GHz or 5GHz band on your router. If you receive an error on your PS4 that the signal is too weak then just reset or reboot your router.I know this sound weird but trust me it helps maximum of times otherwise turn off other devices on the network. If your PS4 is far from the router then try to move your system as closer to the router as you can.
Some time it might be an issue with DNS server setting. Find the setting button on your PS4 menu.In that search for network and in that select set yp internet connection. After that select custom from there. Select the WiFi network from your router.
Once you connected to the network select do not specify option. Select the DNS setting on manual. Setup primary DNS on 8.8.8.8 and secondary DNS on 8.8.4.4
If you have original PS4 then it only connect to the 2.4GHz or 5GHz band on your router. If you receive an error on your PS4 that the signal is too weak then just reset or reboot your router.I know this sound weird but trust me it helps maximum of times otherwise turn off other devices on the network. If your PS4 is far from the router then try to move your system as closer to the router as you can.
Some time it might be an issue with DNS server setting. Find the setting button on your PS4 menu.In that search for network and in that select set yp internet connection. After that select custom from there. Select the WiFi network from your router.
Once you connected to the network select do not specify option. Select the DNS setting on manual. Setup primary DNS on 8.8.8.8 and secondary DNS on 8.8.4.4
Source:- [https://bit.ly/34goJa4|Fix PS4 keeps disconnecting]
If you are not getting all these steps then use Ethernet cable to connect your PS4 and Router. problem solved.