Ubuntu Studio 20.04 desktop environment fails to load

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I have been using Ubuntu Studio 20.04 pretty much since the stable version got out (clean installation on SSD drive, no dual booting or anything like that). Not long after (maybe a month?) I started having this problem where after logging in (using the shipped-in gdm3 as display manager) the desktop environment wouldn’t load properly showing me just a blank screen with the cursor in it and the fans would go nuts -which to me means that the CPU was working full-on but got stuck in some sort of loop-, forcing me to hard-poweroff the machine.
Booting in recovery mode, doing nothing while in it, and then continuing to normal boot seemed to work but I wouldn’t get full graphics capabilities as the system loaded a generic graphics driver (llvmpipe (LLVM 10.0.0, 256 bits)). Since I work on graphics and video, this wasn’t a good workaround.
Then I tried switching the display manager to lightdm (shooting blindly) and hey-ho, happy coincidence, it all started working, so I just kept using lightdm from then on. Now, however, the problem has returned and it doesn’t matter which display manager I choose because the result is the same (though with lightdm I do get a wallpaper in the background).
The recovery mode work-around still works and I have done some updates over the last few days but I didn’t notice anything because I don’t usually power off the machine, so I’m not sure at which point the problem came back…
I am on Gnome 3.36.3, if that helps…
I don’t know what tests to run. Any help would be much appreciated.

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