FlStudio two times, one time also one my extern SSD ( actually FLStudio is on my intern SSD ). And I have also bought another SSD now but I have still the same problem.
But now I Know that the problem ...
FL and this still happens. At first I thought I had a bad drive but it's only extremely slow in FL. Tested with Samsung magician and everything is fine.
I have heard of SSDs not being as fast at first ...