Samsung NVME randomly goes down during activity

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No, @megavolt means you try to add these the kernel parameters:

If you use GRUB

  1. Edit /etc/default/grub to add these kernel parameters in GRUB_CMDLINE_LINUX_DEFAULT= 
nvme_core.default_ps_max_latency_us=0 pcie_aspm=off

  1. Run sudo update-grub

  2. Reboot

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