If Spatial Sound settings keep changing and reverting to Windows Sonic after every restart, here are some working solutions to help you.

How to turn on Spatial Audio on WH-1000XM6 To turn on the 360 Reality Audio Upmix feature, open the Sound Connect app (Sony's app for managing the headphones) and head to "My Device" in the main menu.

How to Switch on Spatial Sound in Windows Microsoft recommends that users follow the following steps to turn on the Spatial Sound feature in Windows 10.