DLGDIAG code = 07 Failed read test element

Hi Sir.
While running Data Lifeguard Tools few times, my WDC 2TB HDD WCC4N2DN6PA9 is always stopped halfway by itself with following same error.
I need your advise.
Model: WD20EZRX-00D8PB0
Firmware: 80.00A80
SMRT Test: Pass
Quick Test result: Fail
Test Error: 06-Quick Test on drive 4 did not complete! Status code -07(Failed read test element), Failure Checkpoint = 102 (Unknown Test) SMART self-test did not complete on drive 4!

Q1) What is the problem with this HDD?
Q2) Is it safe to continue using this HDD?
Q4) Anything I can do to recover this problem?


You could refer to the following link: https://support-en.wd.com/app/answers/detail/a_id/7519