[Elecraft] Curious K2 behavior?

[Randy]

Last weekend I took my K2 to the Huntsville Hamfest to help out with the 
Elecraft booth there.  I had a gel cell battery hooked up to it so folks 
could twist knobs, push buttons and see what happened.  Several folks 
did.  Today I turned the K2 on for the first time since then and 
strangely I had to retune the KAT2 for all bands on both my dipoles.  As 
far as I can tell, neither dipole has changed physically.  One is an 
attic dipole and the other is an inverted vee hung from trees in the 
yard.  Both are fed with ladderline.  The attic dipole uses an LDG BA-1 
4:1 balun and the inverted vee uses the Elecraft BL-2 set to 4:1.  I had 
the inverted vee attached to Ant 1 and the attic antenna to Ant 2.  Both 
had been automatically tuned by the KAT2 to better than 1.2:1 on 80m 
through 10m before the hamfest.

I thought at first that maybe something had reset all my internal data, 
but all the menu parameters I've checked, including the filter settings, 
are unchanged.

Would some set of button punches have cleared my KAT2 settings while 
leaving everything else ok?  I did not have an antenna or dummy load 
connected to the K2 at the hamfest, but I'm pretty sure I would have 
noticed someone doing Tune on all the bands on both antennas!

Retuning the KAT2 worked fine, so there's no residual problem, but it's 
a puzzle to me as to how this could have happened???

73,
Randy, KS4L