USB Microphone fades out with RealPresense

We use Polycom RealPresense for desktop video conferencing. If the microphone gain is set to a high level (usually needed) and it hears a loud noise the microphone gain is reduced (looking in control panel>sound>recording>microphone>levels).
The gain then does not recover when the background noise has reduced. Eventually the gain drops to 29% where it stays.
This only happens with USB microphones and several have been tried. The drivers have been updated to the latest. It behaves the same with older versions of the application as well as the latest. It happens with Windows 7, both X86 and X64 versions.
We have not tried other versions of Windows, as these would be irrelevant.
It also happens with other communication software, but not if only Windows is running.
Has anyone else met with and resolved this problem?
If this is the wrong forum to post this question I would be grateful if a moderator could move it and then let me know.

Its something not related to Windows then. May be application or drivers ?
Arnav Sharma | http://arnavsharma.net/ Please remember to click “Mark as Answer” on the post that helps you, and to click “Unmark as Answer” if a marked post does not actually answer your question. This can be beneficial to other community members reading
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