I’m not at my pc right now so I can’t get specific but, I had similar issues until I deleted the sound driver (and everything else except the graphics driver itself) from the graphics card. Also my mother board came with two sound drivers. I deleted the one named “HD audio driver”. Also, I made sure that all the latest drivers for the motherboard were installed. These things fixed my issues completely.
Also wondering if any of this is related… it does not apply to me so I did not read through it completely enough to know if your cpu applies.
Regards. 