When your Cycles render crashes, it’s usually from three main issues: insufficient system resources (RAM/GPU memory), overly complex 3D models (high polygons/heavy textures), or misconfigured render settings (too many samples/large tiles).
These problems strain your hardware—resource limits mean your computer can’t handle the load, complex models add unnecessary processing, and bad settings push your setup too far.
To fix it, simplify your model (reduce polygons/textures), lower samples or tile size, or close other apps to free up memory.