Comment 8 for bug 2032577

That sounds even more like a RAM issue (that it stopped occurring with the same kernel and software version).

Perhaps when you switched away from Wayland, your graphics card is now used less heavily, and when the GPU was used more, the RAM got hotter or got minimally less power and therefore had issues, or something. (This is something people have indeed seen, so…)

If you can trigger it reliably again, the changes would indeed be interesting.