The download process stopped

Dear friends
When I perform the search and want to attain the electronic structure data
with MPRester(“………”) as mpr:
properties = [‘formula_pretty’, ‘symmetry’, ‘formation_energy_per_atom’,
‘band_gap’, ‘energy_above_hull’,‘cbm’,‘vbm’ ‘efermi’,
‘magnetic_ordering’, ‘bandstructure’,‘dos’]
docs = = [HasProps.electronic_structure], fields=properties)
formula = [doc.formula_pretty for doc in docs]
my download process stopped at 80% without any message. Does it because of the heavy download or server problems?
Thank you in advance for your help and guidance