The issues we are seeing are across several models of our Lenovo laptops. It seems to be related to the internal audio device using embedded audio .
The audiodg.exe “ Audio Device Graph Isolation” will use high amounts of CPU when proximity is running. When you end proximity, CPU decreases to normal levels. Also we have noticed that when using a generic USB audio such as the Jabra 410 USB speaker or a generic headset . Devices with no enhanced audio seem to not be impacted.