[Elecraft] K3 sometimes forgets set power level?

[AC6JA at aol.com]

I have my K3 set up with my KPA500 and to run 15 watts in OPER and 100  
watts in STBY.
It seems every so often when I switch between OPER and STBY, both power  
levels will be at 15 watts and I have to roll the power back up to 100 watts 
in  STBY mode.
Any ideas as to why the K3 would forget the power level?
I am running the most current firmware versions in both.
Any info would be appreciated.
 
Mike  AC6JA
K3 #3215