FYI: I ran into this when I tried to setup a PS3 to use wifi the other day for cord management. My PC which is always wired never had the issue, and I hadn't had problems before, so I re-wired my PS3, and the problem went away. I normally would prefer to wire anyway because of latency issues, though I honestly don't know why wifi would trigger disconnects.

Though if it were a dhcp lease renewal, maybe the PS3 kicks the app every refresh? Routers with dhcp often default to shorter leases for wifi then wired.