Good Morning, Dependable Productions,
I have sent you an upload link, so I can see why this happens.
I will get an email from DropBox when the file has arrived.
I let you know instantly what I have found.
All the best
P.S.: Rendering can be stopped by (but rendered in editor with an *)
Object Manager> Object: Traffic Lights set to red for Render (you mentioned it that they are not red)*
Layers, the layer on which the object sits, is set to not render*
Compositing tag, several settings:
• Not seen by the camera*
• Not seen by transparency/refraction (if behind an object with those qualities)*
• Background and Object have the same material and object is set: Render To Background.*
Similar, transparent object and Ray Depth (Render Settings> options)
The Render-settings have specified a frame where the camera can’t see the object anymore, but the time slider is set differently
Physical Render> Depth Of Field too strong (according to a forum’s post a while ago. Motion Blur and/or DOF
The Render Settings> Save> Render Region is set and the object is outside of it.
Background and Object have the same material and object is set:Compositing Tag Render To Background.*
There might be more, but a scene file would be needed if the typical suspects are not the cause.