spring arm issue when using spring arm as a child

i have an issue when using spring arm as a child to make the effect of flash light leading the camera. the issue is the when moving the mouse too fast the flash light wants to make a 360 move and the camera can’t deside weather to follow it or not and i stays there. i can tell that i saw that issue when setting the camera lag on the spirng arm in 2.5 and i don’t want to rise it cause i like how it feels. i tried for three days first to set a fixed rotation for the camera in a particular distance from the flash light to force the camera follow the flash light and second to set a system to ingrease the lag value with timelines after a particular distance from the flash light. Both gave me some results but didn’t fix the problem. I can’t thing any other way doing it.