Output Device Confusion, But Only After Multitrack Mixdown

I have an oddly specific issue.

My installation of Adobe Audition CC (build 11.1.1.3) on Windows 10 mostly behaves itself, but after I do a multitrack mixdown it becomes confused. When I try to play anything (the session or the mixed-down WAV file) after the mixdown, I get the error message, "Audition has detected a problem with the current audio hardware settings. The default output device is not responding and may be disconnect." (See below.) The weird thing is that nothing has changed. All I've done is mixed down a session.

My audio hardware is a Focusrite USB 2.0 device and I'm using its ASIO driver.

If I re-start Audition, it fixes the issue and that's what I've been doing for months, but it would be nice to avoid restarting after every mixdown.

Thanks for any insight.

Jeremy