[Elecraft] K2 Transmitter Power Issue

[kc4wvl]

K2 s/n 4276
Firmware Revision(s):  2.04P  1.09

I am having a problem with output power stability. Example: Power set to 5 watts. When transmitting (into a dummy load), power out is all over the place, from as low as .2 watts to as high as 12 watts. This fluctuation is very rapid. Measured current (at the P/S) fluctuates with the power output fluctuation.

Can anyone give me an indication of any possible cause and solution?

Thanks.

73's de KC4WVL
William Smith