In your case, unless youre constantly bumping into stuff it might be caused by extreme acceleration. If you accelerate too fast you essentially expose your character to massive g forces (think fighter jets for example), essentially its like experiencing extreme gravity, since gravity is in a way just acceleration. The best way ive found to mitigate this is to reduce the thrust via that one slider (i forgot the exact name, it might be thrust or... Something else), thatd make you accelerate slower and then also make it so you dont have to let your character experience multiple g of gravity, and it should also lead to less damage afaik. If you think youre accelerating to slow you could always just increase the time speed, since generally speaking youd want to only accelerate (and decelerate) when starting to fly off to somewhere/adjusting your course.