@Jojorender Curious if you're using a Mograph Cloner set to Render Instances or Multi-Instances? I have had some weird behaviors in Cloners when using lights. I was setting up a test with Mograph and got funky results any time I changed settings, mostly with either the IR or the Interactive Viewport. I was going to see if the final render matched the funkiness, but it locked up and crashed.
For whatever reason, C4D hasn't been generating a proper crash report or scene file otherwise I'd post it.