July 2022, and tried restoring my 2x4TB Western Digital Red drives in RAID1 config, with data from a backup drive, hard wired to a router (Win10 USB drive to router to NAS) and my LS421DE hung every few minutes, and sometimes seconds, after 1 to 8gb of transferred data while using the latest 1.8x firmware. Over the years, I have used all upgrded firmwares and experienced the same issue while streaming large files from the NAS. I downgraded to 1.34 (SMBv1? argg) and it has been running for a day without the NAS hanging! Using Beyond Compare, by Scooter Software, to transfer the 3.5TB of data, it has recorded multiple network issues (assumption that the NAS reset briefly or some other network anomoly over night) and I have had to re-mirror some folders to ensure the few failed files transferred completely. I am however not needing to babysitting the NAS, pulling the plug to reset it, every few minutes. This issue has obviously been going on for years and I have just 'put up with it', but I am looking toward Synology for my next system unless Buffalo can do SOMETHING about this issue to regain my confidence in their product, other than saying it cannot be duplicated in their lab. One positive I have about this product is it sort of still (partially) works as a backup/NAS solution and I have owned it for many years. I have not used many of the features that are embedded other than SMB continuously and the iTunes server for a week.
Sincerely,
Tom