@Daniel Hudson We are experiencing the same on our Lenovo Hub 500s. We have seen it in the past on some units when it comes to .NET updates. This time it is the 1903 updates. Some of our devices are are not passing mic audio to the far end until we reboot or install the update manually. We have about 300 Lenovo Hub 500s and growing, so manual update pushes are not ideal.
We opened tickets with Lenovo and Microsoft. They have not found any issues in the logs.