You don't know how he is playing the game... for example one way to crash the game is if you are doing a crafting build, mass manufacture items for sale, and attempt to sell them all at once, the game has a massive memory leak on the inventory screen that seemly is combinatorial too (seemly it reloads the inventory screen whenever you sell a item, and keeps the old inventory memory alongside the reloaded, so the increase is faster than linear), when it runs out of RAM it crashes.
You don't know how he is playing the game... for example one way to crash the game is if you are doing a crafting build, mass manufacture items for sale, and attempt to sell them all at once, the game has a massive memory leak on the inventory screen that seemly is combinatorial too (seemly it reloads the inventory screen whenever you sell a item, and keeps the old inventory memory alongside the reloaded, so the increase is faster than linear), when it runs out of RAM it crashes.