So I'm running a 64bit machine running Debian 9.1 with KDE.
Sadly it regularly freezes so that I can't do nothing but moving the mouse; sound keeps running.
Furthermore sometimes it shows a blue screen.
I did not have these problems earlier with Debian 9.0 and Cinnamon.
How can I find out what's causing this? What are relevant logs? Could my NVIDIA graphics card or my RAM be causing this? I'm still new to GNU/Linux and any help is welcome.
Edit: it's gone now. I only had it the early days after installation.