NOTE: please read from this post 9 March further down the thread, this post is now out of date.

I have the latest W10 build, fully up to date. It's running on an i7 2600K, 16GB RAM (which passes memtest x86 tests), good brand motherboard (I forget which one I got but I could check), two SSS (Samsung 840 pro, OWC 120 pro) and four hard disks. Two of the disks are 4TB HGST formatted ReFS in a mirror pair.

I've just run a Macrium Reflect image, putting the image onto my OWC SSD. The image has been successfully verified twice. I copied the image file (16GB) from the SSD to the ReFS SS volume, which completed without error. When I ran the Reflect verify on the file it failed. I copied the image again and it passed verification.

Looking into the event logs I can see events that are ReFS failures - around one a day, different files. It fixes the errors each time.

Text: The file system detected a checksum error and was able to correct it. 
Source: ReFSv1
EventID: 132

Unfortunately it doesn't seem to say which disk the error was with so I don't know if it's just one faulty disk. It seems that Windows copy is the thing that's failing - you'd have thought that was an absolute basic that was licked years ago. There doesn't seem to be a good program to copy then verify - I tried one but it made little difference.

I'm looking for general advice or suggestions. Memtest x86 has been run for > 24 hours, no issues there.

NOTE: please read from this post 9 March further down the thread, this post is now out of date.