Losing connection from iTunes after 1 hour

as title says, atv2 seems losing connection itunes.

can watching film after hour film stops , goes atv menu. when try start again can't find imac. way can working again buy turning off home sharing in itunes, turning on again. once have done carries on again.

have searched through internet , can see not alone, can't seem find difinitive answer

using wpa2 encryption, connected wirelessly , imac on wireless too. seems have started , doing before latest wireless update apple. atv2 not jailbroken

hints/tips appreciated.

 

try changing wireless channel on router. neighbour maybe has new router on same channel , causing interference, or cordless telephone.

 

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