often stuck

When I use the rendering script, I often get stuck. What is the matter? Blender always fails to exit normally, causing it to stop running but not exit when rendering more than 500 times. My configuration is 2V100, 32G, CPU memory 60G, storage capacity 1T. In order to avoid network problems, I have downloaded it locally, but it still gets stuck during operation. Is there any solution?

python3 scripts/distributed.py \
--num_gpus 2 \
--workers_per_gpu 2 \
--input_models_path(my_path)