I read bug reports from 2020 when others claimed the same and there was no solution, Funcom responded with a bug fix that will be delivered shortly after, it seems it wasn’t applied or it wasn’t enough.
I tried dragging another thrall from Sepermeru to my base, looking at it constantly, one of the responses from 2020 said it had something to do with the ragdoll physics of the dragged thrall which could mess to the point of freezing the game if the player doesn’t look at it, that refreshes the whatever physics do.