Certainly this surprises me since the SSD is just 2 weeks old and I only have installed Windows and some other software. This problem encourages me to try using a few third-party HDD check tools such as CrystalDiskInfo, HDD Scan, HD Tune. All of them report my SSD is OK, every S.M.A.R.T. attribute is green. Then I used CrystalDiskMark to benchmark the performance. The result is satisfactory as read/write speed is as advertised.