SSD gets very slow after being used at 100% for a short amount of time

[Lokplart Volrin]

Hello. I've just built a new PC and I got a brand new Kingston NV2 1 TB PCIe 4.0 NVMe, M.2 for it. After installing Windows 10 and doing all the updates, bios updates, motherboard, gpu and cpu drivers, etc I tried installing a large game on the SSD. At first it had good performance but in the span of 1h-1.5h it decreased A LOT. I'm talking 100% usage at 2MB/s. It goes to 0% after being idle for a while but even opening the File Explorer makes it jump back to 100%I tried all the things you find when searching for disk at 100% issues, chkdsk, windows memory diagnostics, updating drivers, memtest

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