This is very hard to say without knowing exactly what is going on in your comp and what the nature of the failure is. Could you have reset the work area? Could you be running out of ram? It would help if we saw a screenshot of the Composition with all properties revealed for the problematic layer. It would help if we knew if the entire comp would render if you turned off the C4D layer. It would also help if we knew if there were any error messages.
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