Question about Red Plus - 515310

I bought such a WD red plus 10TB a few weeks ago, at that time the price was stated a few CHF differently (269.- due to currency fluctuations). So you can currently calculate the price per TB yourself (among other things in the product comparison).
Side note: I replaced in an ICY box (4 HDs) one of the three 4 WD red Plus 4TB (another 4TB was replaced earlier with an 8TB) with the same type of 10 TB. Purpose: hourly, automatic backups of my iMac with TimeMachine. Unfortunately, the 10TB red plus often says goodbye after a few hours. I am now mounting this in another enclosure and see where the fault lies.... (Contacts or narrow-bodied ICY box?)