I've had a problem a couple of times where my SkyEcho module goes offline and when that happens SkyDemon stops navigating.
SkyEcho going off line obviously isn't your problem but when this happens could you revert to using the location services so that SD retains some situational awareness. Or is there a quick and easy way to switch data sources?
Some sort of obvious warning would still be needed of course.
Hope you can help,
Chris.