The StudioLive mixers will automatically save their current settings approximately 3-5 seconds after the last parameter change. When the mixer is auto-saving, the Store light will turn on briefly to indicate this save process.
If the mixer is powered off while it's auto-saving, the mixer state save can become corrupt, causing it to lose some or all of its previous state settings, and revert to factory defaults.
In order to ensure that the mixer's auto-save is successful and that it will power on with all of its previous settings, you should make sure to not power the mixer off when the Store light is lit indicating that the mixer is auto-saving.