audiodg.exe not releasing memory even after IAudioClient::Release is called

Question

Our application switches between audio playback devices. So, it gets the IID_IAudioClient interface through IMMDevice::Activate and then calls IAudioClient::Initialize to initialize the audio stream. When the playback device changes, the interface pointer to IID_IAudioClient is released by calling the methods in the sequence,
IAudioClient::Stop
IAudioClient::Reset
IAudioClient::Release
But, after the playback device change and IMMDevice::Activate, IAudioClient::Initialize are called again the memory utilization in audiodg.exe increases by about 4MB and it keeps increasing as the playback device switching and the above call sequence continues.
Am I missing anything that causes this issue in audiodg.exe.

Answer 1

According to Recovering from an Invalid-Device Error, It's enough to

Release the IAudioClient interface and any other WASAPI interfaces that it has acquired on the device.

There could exist any other WASAPI interfaces that it has acquired on the device and not released. See bool CWASAPIRenderer::HandleStreamSwitchEvent() for an example.
It's better to show a minimal, reproducible sample without private information.

Answer 2

Thank you for your support and pointing me in the right direction.
I found that IAudioRenderClient::Release was not called in our code when switching the playback devices. After adding the code to release the interface, the memory is getting released in audiodg.exe and does not keep adding up on switching the playback device.