[Elecraft] K3: power output 'jumps' - help needed

[Ralph Parker]

On CW, K3 #1823 power output 'jumps' (for lack of a more descriptive word)
intermittently. While either sending CW (or holding the key down), with the
output power set to 100 watts, the indicated power output occasionally
'jumps' up to 130 watts, or down to 80 watts. This lasts for a character or
two and then returns to 100 watts. This happens about 3-4 times a minute
during a two minute transmission. It is also noticeable while sending only
my call once (eg. while calling a DX station).

The 'jump' happens whether the radio is connected to an antenna via ANT 1
or dummy load via ANT 2. It is evident on both internal output meter and an
external power meter. The antenna tuner is bypassed.
It is evident on my amplifier input/output meters - the amplifier doesn't
like the increased drive, and shuts down temporarily. This is a real nuisance!

Elecraft has tried to help, but suggests an ALC software problem, in which
case other K3s should have the same problem. Thence my request:
Please try this at home - if you have the same results, let me know.

Other things I have tried:
A different power supply
A straight key instead of my keyer
Switching antenna connectors
Different power levels
Updated software (currently 2.46)
Radio in 'TUNE' mode (as opposed to external key)
I have not yet used the radio in SSB or data modes.

So:
Hardware problem (unique to #1823) or software problem (others have it too)?
Hopefully, this will help us narrow it down.

On a slightly different (but maybe related) matter:
After I adjust my power output, on transmission the power starts out low,
rises to the preset level, and remains stable on subsequent transmissions
(like it was re-calibrating itself during the first transmission). I can
live with this if neccessary.

At least one other local K3 owner reports that under the above conditions,
his power starts high and then decreases to the preset level. Again, a real
nuisance while driving an amplifier!

I'm looking forward to your comments.

VE7XF