Every time you open a new scene, use Forensic to inspect the scene integrity, modifiers, plugins and quickly fix any problems before getting started.
Working on a bad scene will likely cause you issues. Some typical issues might be; empty objects crashing, drawn-out simulation times, cad blocks and linked composites clogging up scenes, 3rd-party plugin mismatches e.g, Vray planes not rendering with Arnold and Corona lights.
How to install Forensic in 3dsMax