I can try on another PC, same amout of Vram and a 12 Gb RTX3080, older CPU (gen 10 i7)…
To me, i indeed think the main cause is indeed within PCG, I’m sure there are memory leaks somewhere (PCG, Splines) since memory consumption increased ever time a PCG is generated on whatever change (even when unrelated). An error in the script should manifest itself every time, as well as hardware issues. Maybe is the scale an issue?