Yes, these usually caused by cables, connections or sometimes power source. With 2.5" external hard disks it is not rare, especially if used on single USB 2.0 connection which may not provide enough power for proper operation. As a result, the data may be damaged/corrupted and even the disk drive health can degrade. This is why likely the health is 60%.
You can clear this error counter at the S.M.A.R.T. page if you select the attribute 184 and in the "Offset" column click on the 0 between the + and -
Then, after the small confirmation window, you can specify -75 (the amount of problems with negative sign).
Then such 75 errors will be no longer displayed / counted by this Hard Disk Sentinel installation, just possible new issues will be reported.
However, as the error-level threshold reached, the health may not improve.
If you use Report menu -> Send test report to developer option, it is possible to check the complete status of the disk drive and based on that I can advise, for example by checking with different tests, to verify/confirm its usability.