JorgeB

Look for diags from the previous shutdown attempt in the flash drive /logs folder, and if they exist, post them here.

That look's more like a question for the plugin support thread, but check the permissions for the nested dataset and adjust if needed.

That normal if it was disabled, you have to reassign it, post the complete diagnostics.

The errors are likely form the old cable, they don't reset.

Not sure what you mean, they look the same to me, post new diags after array start.

That's expected:

See here for how to replace the flash drive: https://docs.unraid.net/unraid-os/manual/changing-the-flash-device/ If you cannot copy the /config from the old one and need help with the device assignments see the end of that page.

Disk looks fine, but there are UDMA CRC errors, so most likely it dropped due to a bad SATA cable, if you didn't yet reboot since it dropped, post eh diagnostics.

You could still use it to see if it boots. SO it's working now? Diags look OK to me for now.

Did you try running the server with just one stick? It should't. If you are using PCIe ACS override it's been know to in some rare cases cause stability issues.

zfs is detecting data corruption, start by running memtest.

Please post the diagnostics.

Please don't post multiple threads about the same thing, merged both posts.

Once the rebuild is done reboot and post new diags if the disk is unmountable again.

Unfortunately still not, one other thing you can try is to boot the server in safe mode with all docker containers/VMs disabled, let it run as a basic NAS for a few days, if it still crashes it's likely a hardware problem, if it doesn't start turning on the other services one by one.