Desktop freezes when shutting down Mac

[Silly John Fatty]

I'm wondering if someone else has this "problem".

Basically, when I shut down my Mac, the desktop would freeze for a second before it gets shut down. The doc is already about this disappear into the bottom of the screen (I have it set to the center) and only the top half would stand there. The brightness of the desktop would be lower too. It would stay like this for a few seconds, then it would shut down.

What is this? I've had this before but it had disappeared for some reason.
Has it maybe to do with my SSD? Because I haven't had this before I installed this one. It's a Samsung SSD 850 Pro or something like this.

Maybe it has to do with Yosemite also. Hard to say…

 

[Silly John Fatty]

I thought it may also have to do with the fact that I sometimes have several accounts open. So I decided to log them all out except one, from which I would shut down the computer. But no, the problem is still there. It tells me something may be wrong with the Mac…

Nobody?