to those using unifi with router from TM plus with custom firmware if you keep getting DC from PSN is because a few matter.

1. Someone do a lot of streaming using your wifi
2. You turn on your torrent in the same time you play online on PS3

no matter you use LAN or wifi you will face the same problem.
so how to prevent this? EASY.

if you play online on ps3 just turn of the wifi or if ur ps3 using wifi batter remind your house mate not to download anything of do some heavy streaming la. for me i just turn off the wifi and use cable on my ps3