[Elecraft] K1 Power Out flaky

[w1dwz w1dwz]

I am an  ELECRAFT Newbie.     Just finished  a K! and it works great  out
of the box. I am slowly learning the operating stunts with the TAP  /
HOLD   feature .
One little glitch . To set  the output power  , it sets properly , say at
4.0 Watts    ,   with the   WPM  +/-   buttons  ,  but after a few seconds
it dribbles around and goes down to   0.5 Watts or whatever.... Tweaked the
cans on the Filter Board  but still NG  .    Wonder if others have
experienced this anomaly.   Dave   W1DWZ  RI