I have done everything I know to do from uninstalling, reinstalling, getting a new usb sound card -- everything. I have using Windows 10. And I have several mics most in headphones, but one external usb mic. Everyone of them work for a moment -- then mute themselves after a few minutes. I have changed the setting to "do nothing" and changed the properties to "Allow applications to take exclusive control of this device." I have restored defaults. I am perplexed to say the least, and our IT guy is as well. Please help me as soon as possible. I need to make some recordings.