Macbook Pro Retina Mid 2014 - Thunderbolt2 Issue

[El_Febio 2]

Goodmorning everyone,
I am happy owner of the object in title for 3 months. After a while I purchased a Thunderbolt 2 disk Lacie d2, 3TB. Right from the start it is ALWAYS been a pain to make it work.
Often the hard drive is blinking, and the Mac does not see it, or even it doesn't turn on. After frequent rebooting, prayers and other tricks it maybe works, otherwise I have to use it via usb3.
Tried to reset anything .. smc, nvram, the Mac itself (initialized) .. but nothing to do. Maybe you do not have the problem for a couple of times, then there falling back. I also tried changing the connection sequence (the Lacie instructions say to first connect the tb, then power the unit)
I also went to the Genius Bar, but the outcome was always the same; after n trials, it all seems ok, then bang.
I'm afraid it is a PC problem .. probably it's the same problem that randomly freeze my mac into boot for many seconds, then it wakes up like nothing (Tried to leave it work, often it takes a minute to start!)

HW specs are  Intel Core i5 (I5-4278U), 8 Gb RAM 1600 MHz DDR3L, Intel Iris 5100

Help

 

 

== EDIT === 25-10-2016

 

Another visit to the genius bar .. this time I was told that it could be to change the logic board, because the TB2 circuit could be damaged.
The fact that it works after reset nvram / smc may suggest an incorrect current distribution.

Some idea? I want to clarify once again that when they work, I have NEVER had a problem .. disconnections or similar ..
Basically I was told that the repair would be more than half of the Mac, so you might as well keep it and use the USB.

The hardware diagnostic told that everything ok, though.

Edited October 26, 2016 by El_Febio
wrong title, mispelling

[El_Febio 2]

bump

[El_Febio 2]

can't believe noone have an idea

 

By watching System Summary I get these messages:

   (no drivers loaded)

Edited October 30, 2016 by El_Febio
added images

[El_Febio 2]

Solved. Change to another mac, same model.