Never take off in smart mode. Angle mode is best all the time. In smart mode, your movement moves the drone. It’s really a headless mode with a geo fence that puts you in the middle of a safe circle. It’s very confusing as there is no orientation so your lack of what you thought was control was actually giving stick info. If you were in the safe circle then it will still try to move away from you even when the sticks are released. One flick down of the right switch to angle mode would have stopped the fly always that you were unfortunately inadvertently creating. My guess is your first flights you were safely away so it behaved. That first crash could be when in descent, you were too close so it was trying to move away. You chasing it moved it more. It becomes a cascade of confusion and panic that often times gets worse. My best advice is to always ascend and get it out of the safe zone. Up is a safe spot to let it hold and hover while you figure out what’s wrong at the control and settings.
That's the thing. It never moved closer to me after taking off.. I took off and landed in the same spot. During flight, I moved it away from me, not towards. It only came towards me when it started veering my direction and wouldn't respond to any direction change. I didn't chase it. didn't move at all. And I tried to ascend or descend. It wouldn't do anything. Wouldn't tilt, wouldn't pitch, would not respond to any controls, even once it was 100 feet away from, careening towards a tree.