Post #15 of this post shows a K40 which may be the same as yours or not.
http://www.peachparts.com/shopforum/showthread.php?t=162305
Apparently they develop minute cracks in the solder connections on the circut board?
If you repost 6am Monday morning more techs will be around and you will probably get some good advice with your problem.
At least it started.