Hi Harald;
Always post your serial #, it really helps narrow down problems.
If older, the 28pin and 5 pin headers on the RF board going to the front
panel were tin and get oxidized.
Change them to gold.
To confirm this is the problem;
remove the two bottom bolts for the FP, pry gently in the two slots to
move the FP out on the pins a small bit then shove the FP back on.
That will temporarily clear poor connections.
Also search at the groups.io page https://groups.io/g/Elecraft-K3/topics
Keith WE6R Elecraft K3/K4 Tech
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