There are a few things you could do:
1. Don't download TV or movies from iTunes directly via the
TV. I find that the unit becomes quite unreliable (slow, locks up) when I do. Buy media via your computer and sync from there.
2. Hardwire the
TV via ethernet. If you do use WIFI at any point (e.g. administering an iTunes library shared on AirDisk on an AEBS), lock your router to 802.11 N only, not A/G/N.
Doing those two things has improved my reliability no end.
As an extra, have you considered installing ATV Flash? It doesn't cost a lot and adds extra functionality that the
TV should feature straight off the bat, e.g. external USB disks, drag and drop, extra file formats, plus support for Boxee and XBMC. Well worth it.
1. Don't download TV or movies from iTunes directly via the

2. Hardwire the

Doing those two things has improved my reliability no end.
As an extra, have you considered installing ATV Flash? It doesn't cost a lot and adds extra functionality that the
