Rich,
You experienced the same symptoms I had and was unable to ever get the system to function more than 10-15 minutes without rebooting. This has to do with the databurst and wifi protocol Sagetech uses to help reduce their power consumption.
I could not continue to use the device especially in the soup when I am busy flying the plane!
The iLevil SW is working great (if you do not need adsb out) and I would recommend it over the Sagetech in our situation.
Let us know how you solve your issue.
Paul