Streaming problems between ipad2 and appletv

[Baltazar]

Hi, new to the site but hopeful that someone can point me in the right direction. I've invested in an iPad2 and appletv2 with the intention of streaming my iPod tunes through my home stereo. Both bits of hardware have wireless Internet connection and occasionally I get the AirPlay icon and everything works fine, can stream audio and video. Occasionally. Usually the icon doesn't show up on the iPad. Home sharing is on. AirPlay on ATV is on. Also have the Remote app which more often than not also doesn't see the ATV. Driving me nuts. What have I missed? Thanks in advance for any suggestions.