Why did you have to replace the entire NAS due to the failure of a single drive? The whole point of a RAID configuration is that you should only have to replace the defective drive, not the whole unit.
Sounds like there is a problem with the new NAS -- perhaps a configuration issue that is different than the old NAS, or even that the new NAS has a defective component.
Sounds like there is a problem with the new NAS -- perhaps a configuration issue that is different than the old NAS, or even that the new NAS has a defective component.