All iMacs going offline after sleeping... ???

I just set up a small 10 iMac office and have them set up for Wake On Lan.
After several hours of sleep they go offline and I can't get to them or wake them anymore... ???
Anyone have any ideas?
All but 2 on the iMacs are only a month old, the other 2 are a year old.

Odd that it won't work, even WakeOnLAN, over dumb switches. With smart switches (ones that do port filtering), I'd suspect that directed broadcast isn't being allowed (a not-uncommon situation on many networks), but with just dumb switches, that wouldn't seem very likely. You might check with the switch vendor just to be sure there isn't some issue with their switches passing directed broadcast, but it's not, as I said, likely to be the issue.
Are the iMacs all the same model, and if so which model? Perhaps you have a model that has issues with waking via Ethernet (don't know if this was chronic with any model, but it's all I can think of right now).

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