LogAudioMixer warning results in a decrease of performance

Unable to reproduce. User believes it is directly related to the speaker they are using when it goes into standby mode. If they unplug the speaker, everything runs okay.  After receiving the warning, there is a major decrease in performance. 

User states the loss in performance is very similar to:  [Link Removed] 

Speaker: Creative Gigaworks T20 Series II

Warning: 

AudioMixerPlatformWindows.cpp on the line 315 (method FMixerPlatformXAudio2::OnDeviceRemoved)

LogAudioMixer: Warning: Audio device removed, falling back to other windows default device.
LogTemp: Resetting audio stream to device id
LogAudioMixer: Display: 0: FrontLeft
LogAudioMixer: Display: 1: FrontRight

1. Create a project from any template
   2. Open the log
   3. Observe a constant flow of warnings (happen every second or more often):
   "LogAudioMixer: Warning: Audio device removed, falling back to other windows default device.

Result: Audio warning, loss of performance

Expected: No loss of performance after receiving audio warning 

Fix UE-51650

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