I had never had glitchy music before. Now on 4.01, on DX12, the music starts glitching heavily a few minutes after I start playing.

And I get massive stutters after about half an hour of gameplay, after visiting a few different locations. I'm on a RTX 3080 with 10gb of vram, I've disabled RT shadows and reflections, using DLSS quality, playing at fixed 30 fps.

I'm quitting playing it for now. Are we getting these bugs fixed or not?

When RT is On and ur GPU VRAM reach over 95% usage at playtrought or even after few times loading/fast travel (at this VRAM usage can go up alot more usage then after load is complited) and soon after ur GPU PCI-E BUS usage will grove to 2-3 times more % of usage, this causing massive FPS drop with stuttering, that not pass even after load game save or FT, untill u restart the game. U can monitor this behavior f.e. in https://www.techpowerup.com/download/techpowerup-gpu-z GPU-Z 'Monitors tab' + deskPin (to pin his window to be allways on top) and change in game video settings to windowed/borderless. Secound but more complicated option is in game OSD monitoring in MSI afterburner/HWinfo + Rivatuner Static server or maybe FPS Monitor will be enough,

In point 1) of my guide u can find FIX for only this exacly behavior memory leak for Nvidia GPU:
The Witcher 3 NG 4.01 - RT Optimalization Guide / Memory Leak Fix
or watch my video (at 04:39 i'm showing how to fix it):
https://www.youtube.com/watch?v=BuCgv-B-ta8

Try, it may help you if this is the case of ur problem, if not then it may not work.