Cannot hear ATC instructions and other aircraft suddenly while AI copilot still responds

For Antizombie4635 it most likely was a Windows bug where it loses the Dolby Atmos settings so that it reverts back to stereo output but MSFS is still outputting Dolby Atmos multi channel audio and the ATC gets assigned to a channel that isn’t front left nor front right. He could have fixed it by setting up Dolby Atmos again.