[Elecraft] Intermittent steady CW send ?

[Dubinse at aol.com]

I suppose I should look for this in the database, but I'm not really sure  
what to call it. I have a nice K3 and, generally I am delighted with it. One 
 small splinter as I slide down the banister happens so infrequently that I 
 suspect it would be difficult to demonstrate "on demand." When working CW 
with  either straight key or paddles and VOX and QSK turned on, maybe once 
in 6 to 10  hours of operation; I will experience a steady CW output. It is 
as if I had  pressed the "tune" button or held the key down. Not 
surprisingly, this is  embarrassing in the middle of a QSO. It seems that the only way 
to stop  this is to turn the power off.   I think that, in my panic, I have  
tried other  things to stop it; but I can't remember what -- only that they  
didn't help. Does the keying circuit(s) have some kind of threshold 
setting? 
 
I will be happy to supply other information as needed and will appreciate  
any guidance from the Elecraft tribe.
 
VY 73 de W3UEC  (Steve Dubin)