Ok, so here's the bad news.
The Kingston A400 is a low end piece of crap. Sorry, that's just the way it is. Kingston does not have a very good track record when it comes to either the legitimacy of their SSD products OR the quality and reliability.
For example:
techreport.com
Kingston drives just tend towards the cheap, low priced end of things. Two years seems awfully short, but the fact is even the best drive can die prematurely. I'm not sure there even needs to be a reason for it aside from just a manufacturing defect. Obviously, things like power failures, surges, short circuits and impacts can definitely contribute to the probability of an early failure.
My advice on trying to use it is, if the drive is bad, it's bad. Verify that it's bad if possible using a drive health utility like hard disk sentinel or even more basic software like Kingston SSD manager, Seatools for Windows or WD lifeguard tools. Run the short and the extended tests.
If there is any indication of a problem with reallocated sectors or other issues, toss the drive in the trash and move on with life. You do not want to make any effort to use a drive that has shown itself to have problems because anything you put on there stands a good chance of being lost when the drive completely fails, if it hasn't already.
The good news is, it SHOULD still be under warranty if you bought it two years ago and have proof of purchase like a reciept or purchase invoice somewhere, since it has a three year warranty.
https://www.kingston.com/us/ssd/a400-solid-state-drive