[Elecraft] K3 huge noise

[mark roz]

Almost lost my hearing.
Loaded 3.27A. NR engaged. F1-1. VFO A CW on 40m. VFO B SSB 40m. AGC ON. Width 250Hz cw. 2.7 ssb.
Now switched from CW to SSB portion of 40m by pushing A/B - horrible noise of very high
amplitude  on speaker or headphones. Turned down the volume to min. and in few few seconds
it stopped. Than again the same thing happened 70% of the time.
This only happens if NR is engaged on A and B VFO and while switching from A to B.
Just did it again-now on the internal speaker. Wow!! it is loud. Will not use NR for now.
Anybody else can duplicate this??
 
Beside that I like my new K3 a lot. This is my second K3.
Mark wq7x