I had the dreaded uncommanded left turn last night.  It happened right at the transition coming into SLVR near the end of the flight.  Heading Select worked fine and I was able to finish the flight, but LNAV was gone for the rest of it.  I seem to remember this happening around the same place before.  I wonder if this is an autopilot glitch or something with Navigraph's CS procedures?

This is my only problem with the airplane.  (Well, that and the external ghost engine sound when everything's turned off.)