The Uconnect system/radio/HVAC screen will reboot while driving or lock up, if you have the HVAC system, heated seats or steering wheel heat on they will remain on because the screen is either locked up or rebooting, neither of which will default to HVAC, seats or steering wheel off. You would need to shut the car down and wait for the power settings to turn everything off, (a minute or two). If the system reboots it usually will not respond to turn the seats, steering wheel or heating off.
We do not have the default settings set to "on" to turn on the seats and steering wheel on cold startup. And yet sometimes on start up they come on automatically anyways. This requires us to shut them off, and then reset the memory position for heat off, steering wheel off, heated seats off.