RC-400 software...
 

Well, interesting things.

I think I've discovered a flaw in the most recent software upgrade.
It would appear that if you jog the directional selection button (a
four way deal much like an analog control stick w/o the stick) the
wrong way, you can cause a system failure trying to get it to go
somewhere it doesn't want to go.

It only happens when you go into the system and GPS setup pages which
to my way of thinking, is a software problem - it shouldn't drop off
the face of the figurative Earth if you make a wrong selection.

Interesting though. Worth a call to the software guys tomorrow.