Why airplay is so unstable?!!!

I have iphone4, iphone4s, and ipad2.

I have two airplay devices. a) Marantz CR-603 mini-hifi amplifier b) apple TV.

I bought Marantz CR603 first, when I pair with iphone4, never had any problem. my ipad2 and iphone4s will always have a problem finding this device, but i found a temp "solution" - everytime, I turn on my marantz hifi, i need to reset my wifi on ipad2 and iphone4s. (turn wifi off then on again).

Although it is not ideal, but at least can get it working...

Recently I bought an AppleTV 3. Now it comes the disaster. Airplay icon on and off, switch wifi on/off sometime no longer work, even on my iphone4, sometimes I need to set Apple TV airplay on/off, and usually the last resort is to reboot my router.

I went through many threads here, and also tried to follow the instruction here to setup my router. still no luck.. not stable... and have to reboot my router almost everyday before using appletv....

Is Airplay suppose to work like that??? Is there any solution? Is Apple software alway so hopeless? (like apple map on iphone5?) (

People who experienced similiar airplay issue, can you please post here as well so that Apple can lookinto this matter seriously?!!

thank you.

a desperate apple fan.