Drawing disappearing when I go to zoom in

[wataru.kannuzuki]

You might have some hidden or extremely small geometry very far away from your model that’s tricking the camera.

Model disappears when I zoom in

Usually this means that you have some scattered unnecessary geometry (a single short edge is enough) lurking somewhere far from your actual model. It might also be a badly built component or group that has its origin far from the object itself, resulting in an enormous bounding box. This is also the reason for your problems with clipping.

You may also try toggling the perspective between the default and parallel projection.