Mac Pro 2013 fan speeds up to maximum after restart.

My brand new Mac Pro 2013, hanged on shutdown..

so I had to restart by using the button on the cylinder, when it restarted it sounded like a vacuum cleaner, the fan started to spin fast and didn't stop anymore and my mac was suddenly very slow :S.

After restarting the mac pro works fine again! this happened 2 times now...

Already called with apple they said that i should try and work with it and see if the problem comes back again.

Maybe any of you knows what could be wrong.??????

I'm mainly using the machine for Logic Pro X and sometimes for some video editing.

OS : Yosemite - 10.10.2

Mac Pro 6core 2013