I know there are a few threads on here discussing the Boeing 707 and engine fires, but those threads deal with causing them.
I have the opposite problem: they seem to ignite no matter what. At some point in the flight, they ignite. Usually all four of them near simultaneously. I follow the checklists to the letter, and I'm not cruising at max throttle.
Is there something I am missing or something in the checklists that I should/shouldn't do?