EX4100 stops communicating and won't power off

My Cloud OS 3 Personal & Network Attached Storage My Cloud EX Series
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I just bought an EX4100 16TB unit, and got it up and running with the public share, and an 8TB iSCSI target, using MPIO & 9000 byte packets size. It ran for about 7 hours before it stops communicating on the network; it does even respond to an ARP request. All lights are frozen, and the power button doesn’t work. After reading through this thread, I’ve made a couple of conclusions: 1 - I will return this unit right away (fortunately, I had had bought it through Amazon). 2 - Western Digital cannot be trusted to be forthright in their business dealings. I’ve been in IT for over 40 years, and can’t recall a worse instance of a customer service organization being either inept or blatantly dishonest . I do not believe that any capable service organization could not recreate this type of problem, which has been so widely encountered by their customers.