Hi there Seyam Al-Fahad,
There is a possibility that the drive has some sort of mechanical problem. If this value deteriorates, I would say that the best you can do is to get another drive. I guess you can still use it, just don't keep crucial data on it.
Also, it may be a good idea to test the drive with a brand specific testing tool. See whether you will get the same results.
Cheers,
D_Know_WD