[Elecraft] K3 sudden high volume behaviour

[Stephen Prior]

I've been on 80m ssb tonight running 100W both with vox and without.

On two occasions I have gone to receive and been totally deafened in the
headphones, requiring me to turn the af gain down quickly.  The volume level
was as if it were set to maximum.  Restoring the af gain control to the
usual setting restores the correct volume.

I've looked through my archives but recognised any mention of the problem.

The K3 is serial number 980 and has the latest firmware.

Any ideas please?  I have AGC SLP at 12, but I would not have thought that
to be the problem.

Thanks

Stephen G4SJP