@bax2003 my special thanks to you for maintaining this thread. This is an embarrassment of a computer.
You're welcome. I think that this thread is necessity because it was clear after second page that I am not only one with these problems (unfortunately).
Even if my Apple fixes my computer, I will let you know what fixed it and what excatly happened. At this moment I will not share any specific details except that Mac is at my local Authorised Service Provider since 30.01.2017. (with exception of one weekend).
Hello from Canada. ;o) After last two weeks of upgrading my trashcan Mac Pro from Mavericks to Yosemite and above....
I think that this is good thing because there is quite a few of us who came to same conclusion. If computer works fine under one OS version loaded with heavy apps and then starts crashing after 10.10.. this leads to basic root of the problem.
One thing I would really like to test is stability of nMP with eGPU.
Anyway, I will keep you posted.