1
Verify the likely cause
Update UEFI, disable PCIe link-state power saving for testing and manually set the affected slot to PCIe Gen 4.
FULL AI ANALYSIS
NVMe SSD disappears after warm reboot but returns after shutdown
Generated Sep 8, 2026, 11:54:26 AM
Analysis summary
The reported behaviour is consistent with the motherboard firmware does not correctly reset the secondary M.2 controller on warm boot. The safest next step is to verify that hypothesis with a reversible test before making permanent configuration changes.
Possible causes
The motherboard firmware does not correctly reset the secondary M.2 controller on warm boot.
83%A recent software, firmware or configuration change is exposing an existing compatibility issue.
39%Suggested fixes
2
Validate and monitor
Reproduce the issue once after the change, review relevant logs or metrics, and keep a rollback path until the system has remained stable.