airplay no longer works...

Hi

I have a bad wifi connection in the house so bought a powerline netgear booster- the signal is now much better but airplay no longer works. Airplay is set up with speakers throughout the house (wired in) with panels on the walls in different rooms to switch it on and off . After reading up on things I thought it may be because our devices playing the music are now on a different wifi network than the airplay. Can anyone confirm this for me and let me know if there is anything I can do to rectify the problem... PLEASE.

Thanks. x