Iphone disabling router when imac sleeps...

I have my iMac behind an SMC Barricade SMC7008ABR router. I recently upgraded the router firmware which I suspect is the reason why I've started seeing this problem on a network that's been stable for years.
When I put my iMac into either software or hardware sleep, and only if I have my iPhone connected to the usb-docking cradle, within 1-3 seconds, the router suddenly resets itself and then proceeds to berserk itself. All the nodes on the network come down, and the light show begins on the front panel.
Power-cycling the router does not work. Nor will the router reset itself until such time that I remove the iMac from it's slumber.
Unplugging the iPhone (gen 1) from the cradle and sleeping the box does not affect network operations.
I can duplicate this every time.
The router is my DHCP server as well. I can provide more data if requested. Have searched the forums and google'd the problem but couldn't locate any helpful information.
TIA

progress: I unchecked the power-options box: wake for ethernet admin access, and that seems to have solved the issue.

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