The RHR will retain the home setting for a while but will forget. I think you'll get a few weeks and then poof. I've had my Summit since mid March and have re-set the home setting several times (just as Kaflyboy describes.)
I'm sure this will be addressd in the next (and first ???) firmware update for the RHR.
This has happened to me twice in the 4 weeks that I've owned the Jeep, and I also lost addresses saved to the default address book folder. Addresses that were saved as favorites were not wiped out. Very strange.