I've been in my current house for just over two years and have been using the wireless connection because it's just not practical to connect a cable. I have not had any connection problems. No lag in H2H, I haven't been booted from solos or solo battles, everything has been fine.
The last two days, I've been greeted with a "connect to internet" message when turning on my PS4. I kill the power to the modem/router(?), wait a few minutes, turn it back on and everything works fine again. My kids ( also wireless connections ) haven't had a problem with their PS4/Xbox's, so I'm kinda confused.