Searching for mods (looking for mods for Tribes of the East).

Crashes can occur for various reasons, for example, the AI doesn't know how to place mines, and because of this, units with fire traps crash the game (apparently, the heroes have a spell that's prohibited). Crashes also occur with traps and invisible units.

Now, the most annoying crashes are caused by excessively large objects that overload the memory, causing the game to crash. The penultimate version of the Lizardmen in RTF crashed due to the enormous model of the forest. Mods that add new recruitment backgrounds personally crash on my low-end PC in the middle of the game (and the game also takes a long time to load these backgrounds).

There are probably other reasons, but I don't know them all.