[Elecraft] Malfunction of the Keys at the K3 Front Panel after Firmware update

[Keith Trinity WE6R]

Sounds like a bad encoder and was just coincidental to the FW update.
On the 4 small push-button encoders, tap each one and you will probably 
find one that does not toggle the LEDs.
The old encoders leak resistance internally and it disrupts the 
push-button matrix causing wrong button pushes.
Replace all 4, Elecraft part number E640018.
You may be able to tap or snap the bad one repeatedly to get it back to 
working (but it will fail again).
Keith WE6R