Internet Sharing turns itself off after a minute or so

I have an Intel iMac running 10.5.2. Up until a week ago, I was sharing my internet connection with a Windows computer and a wii. Last weekend, the connection went dead, I reset the modem and rebooted my computer, and the internet connection is fine, but the Mac won't share it. I select Internet Sharing in the Preferences, the green dot appears, and for a minute, I can use the internet on the P.C. Then it's off. The preferences panel shows that it's on, but if I reopen preferences, it's no longer checked as on. I've deleted the com.apple.nat.plist file in the library, but no luck.
My system has cable internet to a router, and splitting it 3 ways. It's worked fine for 2 months, until now.

The problem seems to have come from my wireless transmitter (to my wii). I hit a few buttons on it and the problem solved itself. Why would an outside product over-ride my macs internet sharing? No idea, but it's solved for today at least.

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