[Elecraft] No RX or TX on K3

[K3RWN]

I lost both TX and RX on my K3.  The P3 was still showing received signals
on the display.   Then the TX and RX came back.  Then I lost it again.  Then
it resolved itself again.  I am running 4.83 FW.  

 

I had not TXmitted at all.  I was just listening to 10m.  I only know that
lost TX because I tried it when the RX went out.

 

Has anyone else experienced this problem?   Any ideas on what to check?

 

This happened Sat night.  It has been fine since.

 

Rich