Been having this problem where the “S” key seems to get stuck on the keyboard randomly and I think I’ve tracked down when it happens.
It seems to happen when pressing “Ctrl S” to save all. Something actually has to save, if you do it and nothing saves, it won’t get stuck, but if something saves, it will get stuck. So then, after that, when I press mouse left or mouse right, the camera would start flying backwards without touching the keyboard. To recover, I can tap “S” again while holding mouse left or right.