mtndriver

My 2106 XLT 3.5 has a flasher issue. Flashers work fine for a while on all four corners, then occasionally when I active the turn signals I get fast flashing. At this point one or both front flashers will not illuminate. Both front flashers will not illuminate during rest of drive, and dashboard will have fast flash when turning on the signals. Once vehicle is turned off they seem to reset (not all of the time), left flasher will work properly but right flasher will not illuminate and give fast flash. If they are fast flashing and I turn on the hazards I get a slow flash but the fronts are not illuminating. Rears work properly the whole time. This intermittent problem has been going on for a few days, all bulbs are good and work. Not sure wheres to start to diagnose the issue, or if I need the dealer for BCM programming.