I tested a bit further and it does seem that Vox is making changes to the sound preferences when the screen wakes up. As Joey mentioned, Turning DPS back on returns everything to normal. *Note* I am running the latest version of the Vox player which says it’s a Beta version. Is this the same version you are running? If so, might be something to mention to them while they are in Beta mode. If it’s happening in another version it may have always been an issue that they have not looked into. Let me know. Thanks!