Wwise runtime does not reap its threads on shutdown?

Question

We're having a rare issue in all of our Windows builds where we'll get an access violation in the XAudio2_7.dll while shutting down.

This only occurs while we're shutting down and, from the times it's been observed, we've already asked the Wwise runtime modules to terminate.

This seemed odd to me, because I confirmed that various Wwise threads (Such as the monitor and event threads) were still alive even though their modules' ::Term functions returned and did not seem to spit anything into the TTY.

I also double-checked that our shutdown sequence is correct, and it lines up with the sequence described in the "Terminate the Different Modules of the Sound Engine" in the SDK docs.

Is the runtime not supposed to reap its threads? What else should I be checking?