Why does Premiere render the same sequence sometimes fast and sometimes really slow?

I use Premiere Pro CC 2014.
I have a Nvidia GTX 590
Intel Core i7 X990 @ 3.47GHz
24GB RAM
Windows 7 (64)
200GB free space on an SSD drive and 2 more drives with each 1TB free.
I'm having trouble with performance when rendering sequences.
The sequences themselves are pretty simple. They contain MOV files from my Canon EOS 5D Mark III and transparent PNG files as overlays for titles and additional graphics.
I also use lumetri looks and have turned on Cuda rendering. As a codec for exporting I use H264 (fullhd, 25fps, 20mbits, 2pass, max render quality, max depth)
Whether or not I export in Premiere or via AME doesn't matter, the problem stays the same.
Now, when I start exporting, at one point, which is seemingly random (sometimes at 35%, sometimes at 60%, sometimes at 2% - I'm talking about the same sequence!) rendering becomes really really slow (~1 hour for a 3min video), and I don't understand why. I keeps slow until the whole sequence is finished. But before that, rendering was fast!
But sometimes, I'm lucky, and - after restarting my computer and Premiere, the same sequences render in whole, in under 2 minutes!
So obviously my computer is able to render fast. But it does not always do that. Sometimes - even after a fresh reboot, I'm out of luck and the same sequence renders in an hour - but only after a random point in the sequence.
It's as if Premiere stumbles and can't get up again. The only thing that CAN help (though does not alway), is rebooting the system and hoping for the best.
Where does this strange behaviour come from? I use ordinary footage, ordinary filters and an ordinary export codec. I have lots of RAM and lots of disk space
I have not found a topic in this forum with a similar problem

Similar problem here but on a Mac.   AME is always much slower than directly exporting from Premiere, but if I start to get slow renders a reboot always sorts the issue out.

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