No end in sight

I've ordered our fÃ'r new 814RP + four this time SchmuckstÃ'cke avoidable. It all came as ordered.
Unfortunately, two of the four supplied hard drives were defective. Disk park / datentrÃ'gerverwaltung / dban / diskutil (apple) / fdisk (Linux, Microsoft) / NAS all could not do anything with the two defective.
Okay, we make a RMA, this can happen even once I thought to myself. Although the 50% is Ã'rgerlich defective but are perhaps the delivery route was tough.
Now I got after two weeks, the two new panels. Now then comes the hammer. I'm building in both the 814RP + and then set up a Raid 5. After just one day (NAS HDD check) tells me that the one of the new NAS (Slot 3) is flawed and this fÃ'r operation can no longer be used and should I replace them. Also with Disk park / datentrÃ'gerverwaltung / dban / diskutil (apple) / fdisk (Linux, Microsoft) / NAS no chance.

I must say I am very enttÃ'uscht of WD. So I imagine that certainly not before. The nÃ'chste times will surely find it no WD's more.