I've also been facing this issue and have had my motherboard replaced by Dell. I have followed all the guides previously posted including trying to rollback audio drivers (not possible as this is a new laptop).
I have noticed I am on Windows 1803 with the current version at 1809. I'm now updating to 1809 to see if this resolves the issue. Problem is I have to restart for changes to take effect so I won't know if they have worked for days/weeks potentially.
I can report that today I saw my old nemesis again the "Audio renderer error" msg despite moving to 1809. I am out of ideas at the stage and will have to go back to Dell again.