Im having a similar issue on cachyos, but my screen freeze is recoverable by removing the HDMI to external monitor and waiting a bit, then the built in screen will come on and I can plug the HDMI back to continue. I haven’t been able to narrow it down I just write down the time it happens and look at the journalctl but can’t make sense of it
No for me the audio would keep going like nothing happened. It was just the display that was stuck. Like I could alt tab or switch desktop and the audio would follow correctly and when the screen got unstuck it would be where it should