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
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
Result: Audio warning, loss of performance
Expected: No loss of performance after receiving audio warning
There's no existing public thread on this issue, so head over to AnswerHub just mention UE-93401 in the post.