[Elecraft] 20m CW + KPA1500 = Comcast Disconnect

[eric norris]

Dear Gang:
While looking at Europe banging in on 20m FT8 this morning, I switched over to CW, cruised the band, then called CQ DX for a while.  An hour later, a Comcast (Xfinity) technician was knocking on the door (no mask) claiming I was knocking out service to 600 customers (he said he had traced it to my house) and was disconnecting us from the network.  During the entire time, my wife was using a VPN network connecting to her office, and I had the KPA1500 connected to the router so I could use FANticipator to keep the KPA1500 (The Big Dog) quiet and cool.  We had no service interruption.
The router has a mix 31 toroid choke (9 turns) coming out of one port, on a cat6 shielded  cable (all cables brand new) then has another choke before going into a switch--one cable going into the XYL's room with her computer, another cable going through another choke then going into the shack.  We convinced the supervisor to rehook us up.  
All during my operating time, we had no service interruption at our house.  This was, however, the first time I had used the KPA1500 with the 20m beam wich sits directly above the house--I usually only let the Big Dog bark in wee hours of the morning on 40 and 80m.
My house is 65 yrs old, none of the outlets have grounds, not even the bathroom.  The entire kitchen is on one circuit, etc, etc.
Before I call the Comcast supervisor, I'm hoping for some advice from the group.  Not letting the Big Dog bark during the daytime on 10/15/20m is not  a good solution.  In the meantime I'm on WSPR at 1w.  Your advice, please.

73, Eric WD6DBM