Hey Kris, yes it is a common problem with the DeWalt. The cause is one of two things. One, dust build up on the contacts inside the switch or the contacts are pitted. Either way, it is repairable without having to order a new one if you are handy and have the correct hand tools. But first try blowing compressed air into and around the switch. If that doesn't work, tap the side of the control housing with a block of wood.if that does not work, you will have to service the switch.
I'll write a discripstion of how to do it if you need it. Let me know.