My camera seems to randomly turn at times. I was walking in elecktro today and i wasn't looking in any direction and my character looks straight up.
I thought maybe it was because i had my xbox controller plugged in but i unplugged it and restarted my game. It still is happening.
It also happens when holding down alt and looking around. Sometimes it will snap back to where it was before.
I am not sure if you can reproduce this. The only change i made to my game was setting the video memory to 2048 and changing the texture quality/filtering to very high.
edit: changed the settings back and it still was happening. I turned on mouse smoothing and it seemed to happen less. My friend also said it happened to him. I have a video of it but i will need to edit it as i didnt have audio enabled. I will upload it and link it here when i get time tomorrow.