Why does RAM latency skyrocket to cosmic values? How to fix it?

Question

RAM

Recently, I began to notice that the speed of the computer has fallen. Previously, DotA was pulling at 120, now it rests on 60 and responds slowly (it used to be instantaneous).
The problem of performance in games, the browser and other processes alerted.
I checked for viruses, conducted various tests and found that the memory latency skyrocketed.
Just turn on the computer, checked - everything is fine 65ns. I turned on the test again and off we went - 155, 160.
It's just awful. The computer is quite new, I have not encountered such problems before, it worked perfectly.
The usual "refresh" on the desktop instead of the previous instant reaction gives a delay, it feels like the computer is thinking.
Tell people who know what to do, please

PS The test was done with an open browser, wrote this question, so the values ​​\u200b\u200bare higher than previously stated.