Good luck to both. I tried doing all sort of tests to see where the problem is and this is driving me crazy. FYI what I saw is:
- Favorites and any history data for Navigation is lost immediately I shut down an start a car back again, however sometimes I can see Home and Work address, sometimes just one of them (for other it says ''Not set'') and sometimes even a favorites show up, but there is no logical pattern on what you will find when you start a car and mostly it is empty. Anyhow, in large majority of cases (90%+) Navigation favorites and history are empty.
- Setting to start seat heating automatically when I start a car suffer from the same problem above, again with no logical pattern of remembering the setting.
- Infotaiment bakgoround is mostly remembered, but once it happend that system has somehow replaced the backgroung for a current user with a setting that I had earlier with another user (I made additional user account with different email address to troubleshoot) which I find strangest out of entire experience since implicitly it can lead to next owner have access to my current settings & data (!?).
- Phone favorites are remembered first few start ups and then lost, just as with navigation, however this can be solved by using a Guest account constantly (under guest account phone favorites are remembered and work as you would imagine).