I belive is windows. I run test on all configuration. The only whay to avoid is rol back to 1803. I run 1803 for almos a week no issues. I n fact perfect. Now i try some other drivers. There is no way to use realtek, old new almost mid way drivers. Ot even stock drivers that are on the website. In my case codexi. But that is not all. there is or feels like a cascade failure. A MS certified tech was last weekend. the resolucion was. roll to 1803, he stop the update to 1809 and was perfect. For now since RMA will NOT HAPPEND is to use BT speakers, usb headphones or a external or pcie sound card.
Learn, Play Enjoy!