Another test would be to disconnect all Ethernet and connect the 360 directly to the console unit ...(preferably with the 360 Ethernet cable above the deck where it's unlikely to be close to any power wires) ...

If the interference is still present it would indicate the interference is getting in the 360 power cable instead of possibly the 360 Ethernet cable ...

As it stands now, we don't even know if the interference is encroaching into the 360 power circuit or the 360 Ethernet cabling ...

Rickie