[Elecraft] K3 fan problem

[Merv Schweigert]

Noticed this morning when turning on the K3 for the first time after
being off all night,  that the fans were on and changing speed
rapidly.  The fan would run between low and the 3rd speed back
and forth.
Checking the PA temp it was jumping from 25C to 60C back and
forth,  thus the reason the fans were doing the same.   It did this
for about 2 minutes and then went into normal no fan mode.
Anyone had something like this happen?  Bad sensor?  The radio
had just been turned on so could not have been up to 60C temp
indicated.
Never use more than 35 watts power as I drive an amp all the time,

Thanks  73 Merv K9FD/KH6