cartechboy writes "In early October, a Tesla caught on fire in Washington state — and that created a little bit of a stir. Then just before Halloween a second Tesla caught fire. Yesterday, a third Model S caught fire in Tennessee. With the third fire in the books, all happening in similar fashion, today federal investigators are saying they are going to take a look at the situation more closely. As electric car maker's stock shares continue to tumble, some are saying the fires aren't a big deal."