Mac Mini always waking up because of Wake on Demand but never sleeps again

Hi there,
i first of all like to give you an overview of my setup:
2 Locations:
1. Cologne (Germany)
1x Mac Mini - 10.6.2
Router: Linksys WRT 54 GL (running DDWRT 2.4)
2. Düsseldorf (Germany)
1x Mac Mini - 10.6.2
2x Macbook Pro - 10.6.2
Router: Linksys WRT 54 GL (running DDWRT 2.4)
and one Time Capsule attached to it as a network storage (Time Machine) without using any routing function.
Here is what i'd like to do:
As i often travel between Cologne and Düsseldorf i'd like to access every Mac from everywhere. Thats why i bought those 2 Linksys Routers as they allow me to wake my Macs with Magic Packets from my iPhone. Whenever i need a file from the other mac i just hit "wake up" in the Sleepover iPhone-App and the mac will show up in the finder because "Back to my Mac" is enabled.
Everything worked perfectly fine... until.. Snow Leopard came out. It has this nasty "wake on demand" feature which will wake every mac every two hours to perform some sleep proxy adjustment. Unfortunately there is no way to wake a mac running Snow Leopard via Magic Packet without simultaneously activating the Wake on Demand feature.
Now i would be perfectly fine with all macs waking up from time to time but the problem is that all macs perfrom this adjustments 2-3 times perfectly fine but the fourth time they start and will not sleep again. This leads into the situations that every Mac i have is running when i wake up the next morning.
What can i do to avoid this? It is really annoying as i sleep in the same rome as the mac (which is producing some really loud noises at night when running all the time).
I always get "wake reason = RTC" which stands for Real Time Clock, the Wake on Demand stuff...
I am really going crazy as i cannot figure out why those macs just dont sleep anymore.. sometimes it works (for the first 2-3 times) and then it doesnt.
Thank you!
André

I have quite a lot. 2 iPads, 3 iPhones, 2 Apple TV, 1 Windows PC, 1 Windows server, and a few other network appliances (Blu-Ray player, Xbox360, etc.) I haven't changed any configuration on any devices.... it seems this issue just appeared 2 days ago. I will try to reset my router to see if it helps and report back.

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