Wake on demand / wireless doesn't work anymore after a few hours

i use wake on demand regularly screen sharing , new apple tv 2 among other things. noticed after couple of hours imac doesn't wake on wireless anymore service. before works perfectly.

know causing it? i've checked every corner of internet, haven't found solution yet.

imac support wake on wireless, , check-box enabling checked.

thought might caused fact i've extended airport extreme 2 airport expresses. when make sure imac , apple tv both connected airport extreme, it's still not working.

think imac should waking every , let airport extreme know it's there. there way check if happening withouth having sit next few hours?

information equipment:
imac 24" (mid 2007, osx lion 7.2)
airport extreme (3th generation, v7.6)

 

check thread, maybe 1 of suggestions helpful.

http://forums.macrumors.com/showthread.php?p=14173062#post14173062

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also check out page. , check out links, contain useful tips.

http://www.macrumors.com/2009/08/28/a-closer-look-at-snow-leopards-wake-on-demand-feature/

 

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