Well, WD, I tried your 4tb MyCloud for over a week.
It started dropping connection everyday for 3 days in a row !!! Nobody can use a NAS like that!!!
I don’t know what you are doing to fix this, since this is an ongoing problem since last year.
So, I did the sensible thing, and took it back IMMEDIATELY, and got myself a competitors 4tb USB drive and use it locally for backup.
Hope you get it fixed. It had so much potential.