Performance and blockages WD My Cloud

At the commissioning of the first unit block "it seems there is a problem ..." then:
Worm load times NAS dismal: eg loading a 600MB photo directory with subdirectories and 7 900 files, it took 20 minutes to load this directory.
When trying to load multiple directories (2 or 3) complete blockage of the device, and the message "unable loading".
Once loaded some directories, in order to play a movie must wait 7 minutes of charging for even play a song it takes inconceivable .. !!
I return the product