Why does they client change my settings for me?

If I myself set it the way I want it. It keeps putting my client on low spec mode and let the client close during in game. I've got an i7 7700HQ processor, 16gb ram and a 1050ti. I believe it is sufficient for the client and the game. Anyone else having this problem? And why do they even have that feature in the client to change the settings for you in the first place?
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