There is not enough data recorded data to be certain, but there is some interesting stuff happening in the first trace ;

when the Memory usage increase we see at the same time high disk usage!

this disk usage is caused by svchost.exe (10812) which is reading inside "C:\Program Files (x86)" folder ! it seems that this process is downloading and installing something (see the CPU sampled graph call stacks).

on the web many users talk about Steam causing memory leaks.
PSA: Don't enable the Steam Overlay layer - it causes memory leaks when recreating swapchains : vulkan
Memory leak causing crash? - Bug Reports & Support - ARK - Official Community Forums

As a test you can uninstall steam and see if there is any improvement !

More memory issues...-capture.png
More memory issues...-capture1.png