[Elecraft] K3 line-input question

[James Sarte]

Hello Elecrafters,

Quick question - what could have changed in this scenario?

Using K3 in DATA-A mode; audio from DM780 going into K3 via rear audio input
connector.  The K3's input was set to LINE IN in the main menu.  Volume from
the PC was set to 50%, and as such a PSK-31 signal was registering about 6
bars ALC with line input gain set to 14.

After a while of operating without issue, the waterfall turned into a solid
signal; as if the line audio output of the K3 had locked up.  I had to
switch modes on the K3 to get the waterfall back to normal.  After that,
without any change to the PC output volume or K3 mic gain, transmissions now
registered about 3 bars on the ALC meter.  I had to turn the mic gain up to
about 20-21 to reach the same level of input as before.  I checked the all
volume input and output settings, and they're the same as before.  I also
went through and checked the relevant FW settings and nothing had been
modified.

I'm using FW 3.24(D), which I believe was only issued to a very few number
of testers so I can't go into FW details.  I've CC'd Lyle in case this may
be FW issue.  However, I'd just like to find out from the group if anything
similar has occurred to others or been reported.
All suggestions welcome.
-- 
73 de James K2QI