Save5Bucks

I had the same problem listed. I have the Gen 3 A50's. What I did to fix it. Log in to your wifi router, go to wifi settings, under 5g network change the channel to anything less than 100, my next option after 100 was 64. Save your settings. Boom no more sound flicker. The A50's have a weak tolerance to 5g frequency above channel 100, from what I understand that is what their signal transmits at. Hope this helps.

Ok guys I have a solution! I have been so flustered with this after getting my dual 2080ti setup. I run a 3 monitor 4 port set up with NVlink, 4th port is my capture device. I tried the above method of disabling the CSM, which did work in showing the bios boot on my display port monitor but then it would boot off my M.2 which is my operating system drive. So I tried this and it works flawlessly. Under your bios boot menu go to your "Boot from PCI-E/PCI Expansion Devices" Select -> "UEFI Driver first" in the drop-down menu and you're done!