Chris from Toronto here.
We just got apple TV and I have installed the remote app to control it from our iPads, iPhones. Wifi is hooked up to a Dlink DAP-1360 in Ap mode. I can be sitting on the couch and one minute the remote app will be functioning perfect and the next minute it cannot locate ATV on the network. FYI, the tv and router are within 15' and signal is very strong.