3D grundplane vanishes for certain viewing angles (18.0.0.21)

When switching a layer to 3D and activating Draft 3D with the ground plane visible the ground plane does not show if I just dolly away from my object.

Switching to a custom view shows the ground plane but orbiting around make the ground plane vanish at certain angles of the orbit tool (see screen capture and screenshots). Is this behavior intended?

I also got a warning message once while working with the camera tools (see screenshot) which resulted in my layer being deleted by AE.

Unfortunately I cannot attach the files as several menu commands and short cuts do not work (Save as…, Import file…) please see separate screen capture.