[Elecraft] K3 receiver gain problem

[Ron W3ZV]

I am playing in the contest today. I have had two instances where my 
receiver gain has gone down dramatically. It sounds like I have switched 
to the second antenna with nothing attached. Engaging PTT brings it 
back. I installed the second receiver and DVR a week ago. Has been 
working fine until today. The problem is not reproducible. Happens on 
its own schedule.

K3/100 #1248
FW 3.79
No modifications

Any magic out there, or do I wait for Elecraft to wake up Monday?

Ron W3ZV