PS4 Slim internet issue

My brother is having some issues with internet on his slim. Randomly internet will just stop working for him while it works fine on my ps4 pro (mind you I’m on a wired connection he isn’t).

We are in the same house but he is in a different room and I’m in the living room nearby to the router. When internet goes down for him I try connecting to wireless and it connects fine proving it isn’t our internet. When he tests internet it doesn’t fail at internet connection but at the “obtain IP Address” this has occurred multiple times but is intermittent, it just happened again today but after setting up the internet manually it is worked again (for now) I’m suspect the wifi card is going out but I’m unsure. Is there another cause or is it the wifi card? And if it’s the card would a wired connection solve it?