Theres an old thread regarding this drive.
I randomly get notifications:
CT250MX500SSD1 - 1 warnings
There is currently 1 unstable sector on the hard disk. An unstable sector is a sector that can't be read. The drive will automatically swap the bad sector for a good one whenever new data is written to it, however, the original data may be lost.
I have the same issue on v2.6.4.3981
Please advise