[Elecraft] K3: Peculiar BW behavior?

[Walter V. Gilles]

Greetings,
 
I just came across what seems to be a rather peculiar operational quirk in my K3/100 while reducing the BW on CW.  I have 13, 2.8, 1.8 and 0.4 roofing, running current firmware release suite.
 
On 20M CW for example, as I reduced the DSP BW down, and as I hit 0.20 the signal dropped significantly; at 0.15 it completely cut out; at 0.10 it popped in again at a normal volume but shifted enough in freq such that it took a goodly RIT input to find signal pitch again, but stayed there at 0.05.  Going back up in BW, it just reversed the process, going out at 0.15 and coming back in at 0.20 weak and shifted back in freq, then back to normal on up in BW.  This behavior seems mostly to show up on 20M, and fairly repeatable.  Occassioannly it will show up on other bands, but not as severe.
 
Also, on all bands, I hear a distinct click as the BW hits 0.10 going down, then another click as it hits 0.15 on the way up.  No clicking sounds anywhere else on BW changes (i.e. no clicks as the roofing filters switch in/out). Clicks can be heard in the K3 speaker, and headphones.  This clicking is repeatable on all bands.
 
The clicking is mildly annoying but new, and the BW behavior begs some words of wisdom if anybody has some ideas.  I have not reloaded the firmware yet, as that would be my next step to see if something got corrupted.  Note that this peculiar behavior was not present after I loaded the latest firmware - that went without a hitch as usual.
 
Soooo.....anybody have any ideas?  Thanks.  73
 
Walter   WB2IDK