[Elecraft] Strange behaviour xv144 and K3

[Giulio Pico - IW3HVB]

I've found something weird working with this setup:
K3 and XV interface connected to an XV144 via ACC cable and if cables.
Once set up the sw parameters the xverter seems to work fine at home.
If I change band on the K3 the XV144 turns up when I switch band on 144 
MHz and vice versa (sounds normal according to the manuals).

The strange thing happened in two different contests on our portable 
location, where the XV144 doesn't turn up every time.
If the K3 is turned off when in 144 MHz, with the XV144 turned on, 
everything goes off. Ok.
When the K3 is turned back on the XV144 front label flashes for a moment 
then goes off, and the transverter remains dead.
At this point a band switch to HF and back again turns on the 
transverter.....

I am not able to reproduce the issue at home, so there are two possible 
explanations....
1) The /P location is filled with gremlins....
2) There is something else located there that influences the 
communication between the radio and the transverter.

Just for the record, I've double checked the connections between the 
radio and the XV, and they are ok.
The radio is powered via the same switching power supply both at home 
and on the /P station.
The main difference is on the AC, as on the /P location we use an 
inverter power generator (honda, gasoline, 4strokes).

Any clues?

73 de Giulio IW3HVB