Most likely would be a material is "wrong." I've gotten these crashes before. A material node is plugged in somewhere it's not supposed to be for GPU rendering, usually OPTIX is the issue. Yes, you have to re-start Poser to do any more GPU renders as you've just crashed your video card. Then you have to figure out what material made OPTIX crash and change that material. I don't get many of these crashes anymore because I just replace the shaders that come with store bought products before I do any rendering.

W10, Ryzen 5 1600x, 16Gb,RTX2060Super+GTX980, PP11, 11.3.740