Dom, you might want to look at where your wireless router is located and where the placement of your ATV2 is, alot of devices can interfere with the wireless signal, and in some homes the walls themselves can cause a issue because of metal tubing in the wall for wiring, etc... my Netgear router is about 10 feet tops from where my smart TV/XBOX/Wii is located, but there is something in the wall that degrades the wireless signal terribly, I even bought a wifi extender to try and remedy this to no avail, I ended up buy a powerline ethernet kit to resolve all the issue's.
This is a kit that uses your homes existing AC wiring as a network connection, for me, it is very dependable.
Also, I failed to mention, my ATV2 is in my master bedroom which is about 30ft from my router and is has no network issues via wireless, the placement of my router is about 7ft above the floor in my office, with nothing around it except one wall, this wall appears to not block or weaken the signal as does the wall in my back living room does.
Hope this helps some.