A finetuned model is "Connection timed out" but the pretrained one is not

Model A: size of 19649941
Model B(https://gitlab.aicrowd.com/ant_voice1/music-demixing-challenge-starter-kit/-/tree/submission-v0.9/models): size of 19646037

Model B has the nearly the same size and nearal arch as model A , yes model B is a new model that is finetuned based on A, But model B is failed( URLError: <urlopen error [Errno 110] Connection timed out>) , A is successful.