Had the same thing happen here to my K3s but only with the high power board. 
The low power 0 to 12 watt board continued to work normally. Tried a transmit 
gain calibration with no effect.
I sent it back to Elecraft and they replaced both the low and high power boards 
with revisions they deemed "more stable" - KPA3A Rev C9, and KLPA3A Rev B3. 
Greg, W1GF
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