Same problem...
I had this problem with my Edge. Edge shipped a complete new unit, wiring, probes, etc. I first tried just replacing the Box and unit would continue to lock up when it felt like it. So I then replaced the Head unit and all the wiring, probes, etc. and have had no issues since. So in my situation it was actually not the controller causing the lock up but something in the wiring, probes, or head unit.