My Sennheiser headset was working perfectly until recently when my mic stopped working altogether. I also checked the events and I had 5 events for 3 days ago around when it stopped
Amazon.com: Sennheiser SC 30 USB ML (504546) - Single-Sided Business Headset | For Skype for Business | with HD Sound, Noise-Cancelling Microphone, & USB Connector (Black) : Office Products
Sennheiser HS 2 Headset Microphone HS 2 BK 3-PIN B&H Photo Video