[Elecraft] K3S distorted audio

[Rich]

I have seen many posts regarding an issue with the K3(s) audio going 
into distortion once the output power exceeds 12watts.

Is this a premature failure of some component and if so has the problem 
been identified and resolved with new components?

Mine is out there for repair right now and I would like some history 
behind this issue.   I want to make sure it does not reoccur.

I feel that an issue like this on a radio two years old is premature.

Rich

K3RWN