The Unifi in my house when I first got it ... I thought it was unstable because it was new.

My Playstation 3 takes a long time to connect and sometimes it can't because the issue was, the signal strength from the router to my console was so poor that my PS3 couldn't detect and therefore connect. Even if it did, it gets disconnected. My Unifi is situated the floor below my PS3.

What I did was, I kept moving my PS3 console around (the wire permits) and i notice i had different signal strenght for different spots and positions. So whenever I see 80%, I leave it there and everything is fine.

I doubt it's the Unifi's problem and the problem lies with things in the house blocking the signal, I presume.