Had this same problem happen again. Had to uninstall and delete the "Conexant SmartAudio HD" audio driver (which is the latest on the Lenovo site and also the same version pushed by Windows Update), and fall back to the generic "High Definition" Audio driver from Microsoft. Then I had to use the tool to block the Conexant Audio driver from installing from Windows Update. This resolved my issue. This caused every single browser to freeze or eventually crash when on a flash webpage like youtube. With it integrated into Windows 10, there is no uninstall option. It was version 19, the latest flash pushed by Windows Update.