So my problem is kinda weird. I have a total 4 devices. 3 of them work fine and runs smoothly. But the 4th device does connect to wifi but can run internet. With that device u cant even open router page let alone internet sites. In the meantime the ither 3 devices are going good.

First I thought it was my isp problem but they said it was routers. Then i guessed its the 4tg device's problem. But when i reset the router i connected all the devices again. But now the 4 th device is running smoothly but the 3rd one isnt. Idk what to di