How to solve the problem with a drop in write speed on an SSD?

Question

Solid State Drives

SSD Kingston UV400 240 GB (SUV400S37240G). The write speed has dropped significantly.

Speed ​​Test (CrystalDiskMark)

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CrystalDiskMark 5.2.1 x64 (C) 2007-2017 hiyohiyo
                           Crystal Dew World : http://crystalmark.info/
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* MB/s = 1,000,000 bytes/s [SATA/600 = 600,000,000 bytes/s]
* KB = 1000 bytes, KiB = 1024 bytes

   Sequential Read (Q= 32,T= 1) :   278.434 MB/s
  Sequential Write (Q= 32,T= 1) :     0.000 MB/s
  Random Read 4KiB (Q= 32,T= 1) :   166.812 MB/s [ 40725.6 IOPS]
 Random Write 4KiB (Q= 32,T= 1) :    19.637 MB/s [  4794.2 IOPS]
         Sequential Read (T= 1) :   193.354 MB/s
        Sequential Write (T= 1) :    16.358 MB/s
   Random Read 4KiB (Q= 1,T= 1) :    26.957 MB/s [  6581.3 IOPS]
  Random Write 4KiB (Q= 1,T= 1) :     1.054 MB/s [   257.3 IOPS]

  Test : 1024 MiB [C: 75.3% (167.9/223.1 GiB)] (x3)  [Interval=0 sec]
  Date : 2017/06/21 10:02:38
    OS : Windows 10 Professional [10.0 Build 15063] (x64)

The file with SMART parameters is here (could not insert it into the question due to the large number of characters) .
Bought recently. Judging by the SMART parameters, everything is fine with him. But why then did the write speed drop so much and how to solve this problem?

PS

Answer 1

Check disk temperature;
Check the firmware version on the manufacturer's website;
Check it with another program in another OS.
If the problem persists, it's a hardware
problem - try using a different port and a different cable in case of a sata connection.
-Try to connect it to another computer or laptop and check there. If everything is also bad, save the data and carry it for a replacement under warranty. Backups are generally better to do in any case.
If everything is ok in another OS, check the drivers and system settings. Including Intel puts a lot of its services to work with ssd. Reinstall everything. Disable unnecessary services and kill unnecessary programs.
If the ssd is hot, take it out of the case for tests, try to force it to cool.