Read element failure Touro mobile 1To USB3 5400


My Touro mobile 1To USB3 5400 (january 2015) have read element failure deteted by HGST Windows Drive Fitness Test (WinDFT).
Unstable heads clicks are sometimes audible.
I use this HHD less than 4 hours a week for one and a half year.
What may I make to solve this problem, please ?
Thank for your help.
Best regards
François Cornu