I have a strange issue - pressing the mute button on the keyboard, or selecting mute in the Windows volume control doesn't work. When I do that, it very briefly (for a fraction of a second) shows the volume to be muted (both the keyboard light and the windows display), then un-mutes immediately. However, I've discovered that before login, and for a short time after login, it works as expected. Once everything has started up, the problem begins. I've tried disabling some services, particularly anything with Lenovo, Thinkpad or audio, but to no avail. I'm running Creators update, fully updated as of time of posting, and all drivers updated.