[F8 Plus] Suspect issue with nvme slot

[yxyx999]

Hey, I was using Unraid with SSDs in Slot 1 and 4, for about a year without any problems. I wanted to try another OS and added two more drives in slots 2 and 3. When I tried to create a RAID5 with three disks (4th was used for OS), the F( just rebooted without creating a RAID. I thought it was an issue with the OS. I reinstalled TOS6 and was able to create a RAID5. When moving back to Unraid the device began to reboot again while creating an zfs pool or array. I saw in the bios that one nvme controller test failed. after installing the disks in an other pc the disks passed all test.
Back in the F8 Plus, i was swapping the disks between the slots 1-4 to figure out if the disk was the issue or not.
When I moved the disks to the slots 5-8 I was able to create the RAID in the other OS and Unraid without any problem, why I suspect that slot 2 or 3 is the problem.
I put all disks back to slot 1-4 and installed TOS& again to confirm that here the issue also persists. But the RAID5 were created and synct without any error. So I am extremely confused why the slot 2/3 is creating an issue with other OS, but none with TOS and im getting a bit worried to thrust my data to the F8.

Thanks for any input

[CursaYang]

Hello, please refer to this forum post to update the motherboard BIOS and PCIe expansion chip firmware:
viewtopic.php?t=8961