Why are my SYNC®* 4A audio settings returning to default after I turn my vehicle off?
If your vehicle is equipped with SYNC 4A, audio settings such as balance, fade, tone settings, speed-compensated volume, and sound mode settings will go back to their default settings after turning off and restarting your vehicle.
Ford Motor Company is aware of the issue and it will be resolved in a future Ford Power-Up software update.
Additional Topic
What are Ford Power-Up software updates?
*Don’t drive while distracted. Use voice-operated systems when possible; don’t use handheld devices while driving. Some features may be locked out while the vehicle is in gear. Not all features are compatible with all phones.