[Big White Dmax]

I would really check all the wire connections to all four of your trailer brakes. The DIC might feel a short or a poor connection to your trailer brakes. Try spraying an electrical cleaner into your male and female wiring harness. I use LPS electric contact cleaner on all my trailer plugs. If not a trailer problem, maybe it is a problem with your built in brake control and a trip to the dealer might be in your future. Best of luck and please let us know what it turns out to be.