Hi guys, I am near the end of the story, with 90 hours of gameplay.
since 2-3 days the game will start to randomly close itself, without any error message or anything else.
Just as if i ended the game normally.
it happened several times during cutscenes/conversations and now it also happened during normal gameplay.
I checked my cpu and gpu temperature, all is normal.

Is this a known bug, does it have to do with any settings?

its common bug. have to see if 1.5 fixes it.

You can browse to:

C:\GOG Games\The Witcher 3 Wild Hunt\bin\x64 -

There will be files there named something like:

witcher3.exe_crash_20150504_020710714.crashinfo

You can sort by "date modified" to bring the most recent one to the top of the list, and open it with a program like notepad.

Now I'm not saying the information there may help you determine the cause, but its at least useful to know the location incase you open a support ticket.

You haven't mentioned any detail about your hardware, driver version(s), game versions, or settings, so can't really offer anything at the moment.