[Elecraft] K-POD Coiled Cord?

[Keith Trinity WE6R]

I use about a 5 foot nice flexible old computer mouse cord.
Goes from the RJ 6-pin "Radio" jack on K-POD to bottom of K3 Front Panel.
I did NOT connect a wire to the one unused pin on either end, so you 
only need 5 wires.
It works but I occasionally get RF into it on 80m as my antenna radiates 
into the house. "ERR KP1" shows in K3 display, sometimes it makes the 
frequency change.
A couple turns on a toroid  at each end did NOT help.
I suggest keep it as short as possible.
Keith WE6R Elecraft K3 Tech