I also can attest that 5.4.x kernels are giving me unstable system. Intel video
kernel: i915 0000:00:02.0: GPU HANG: ecode 9:1:0x00000000, hang on rcs0
Mouse moves, picture is frozen, I can ssh in and reboot. Sometimes I can switch to other tty e.g. with ctrl+alt+f3, other times switching is very slow or not happening at all.
Noticed that electron-based(?)/gpu accelerated(?) software, like opera/chrome, spotify, vscode sometimes starts to flicker and becomes unusable.
Since I can choose to boot 5.3.x, I use it. So far it works without problems.