Specifically, one of the more likely theories is that a good number of these scrolls were deposited in the desert by various religious communities for safe keeping before the destruction of Jerusalem in 70 CE.
Yes, there was one article published a number of years ago (the author's name escapes me), who did a good job of parsing out the various communities that could have been responsible for certain caves, priests, Zealots, etc. I'm not sure it got much traction, but I found the exercise intriguing.