WD Elements 6TB freeze mac

One Week ago when i use my torrent client to download at one or two minutes they freeze the computer and i can´t do nothing because is freeze i couldn´t force closing. What can I do?
Is my unit defective? My unit is NFTS but seen with three years i think somethig is wrong.

Hi @unai
Have you opened a Support Case? If not opened, for more information, please contact the WD Technical Support team for the best assistance and troubleshooting:

Hi open a case but my hard disk out Warranty. I make some test in windows it don´t show any damage with Win DLG Data life Guard and the test don´t any issue in theory : I don´t know if i only need to pass surface test or format the unit?