[Elecraft] KX3 - Odd behaviour using DVR

[Graham g3tct]

I'm using my KX3 in a ssb contest and calling cq with a message recorded 
in the DVR.

I tap MSG, hold 1 or 2 for a message to be repeated. While transmitting, 
I unplug the headphones (or plug them in if previously unplugged). This 
causes it to stop transmitting, the KX3 display goes blank for a moment 
(scary!) then returns on receive.  I've also sometimes had VFO B come 
back on a different frequency.

Plugging or unplugging phones on normal phone transmit has no weird 
effect.  Is this a bug?

73
Graham