If you try to fix one problem, the audio default playback device. by stop using the vive at all and unplug it. You get a new bug instead, STeamVR is starting automatic when no headset is connected. Also if you remove the power from the link box interface is still starting SteamVR.
Strange thing is, that this not happen when you have the headset connected. SteamVR is not starting automatic then. Just how it need to work !
Using the desktop interface client.
Only running Steam when really needed when i use the HMD. Otherwise keep that type of steam trash turned off.
Tried to disable the handcontroller in interface but that made no difference.