Mac Mini keeps losing network connection

Hey,
I have a Mac Mini 1.1 running 10.6.8, which I use as a headless media server at home. It connects to my BT Infinity 3 router via ethernet cable, and the Wifi is disabled. I connect to it remotely via dns through dyn.com. Other products sharing the network include 2 iPhones, an MBP and a windows laptop.
The problem;
Every few days, the Mac Mini will dissapear from the network and cannot be reached either through the shared devices menu or through Remote Desktop. Only a hard reset of the Mac brings it back. Can anyone help me identify what's causing this problem?
Thanks,
Tim

This normally happens when your neighbor and you are using the same WiFi channel. Try changing the default channel in System Preferences -> Network.

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