Maxing out on RAM causes crash

Hi, I am just getting started with Bazzite, but i'm having issues when trying to play any games.
This is not an issue that i've ever had on Windows, so it's bothering me a little bit.
When i try to play games like Total War, DayZ or Baldurs Gate, I can see that my RAM is maxing out almost straight away, which causes my entire laptop to freeze.

Is there any fix to this, or is it just "buy more RAM"?
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