Oh I forgot to mention, that I bought the Mac Pro as a B-Stock item.
And this is were it becomes 'strange': The error appears since I have the machine - and you don't expect dust in a new computer..?
But I got you. I will clean everything, what is in there
How can we be sure, that the problem really is the overheating? Because the computer starts up again 3-4 seconds after the shut down. Thats a really fast - can it cool down again in such a few time?
Sometimes, after the shut down and start up, the computer stays stable for hours/days..
Thank you so much for your help!
All the best,