Did you add any "new" LED strings to your display? Some LED strings seem to cause more flickering than others in the display, and can feed back to other channels and to other controllers on the same circuit. We literally have every LED channel on the V3 and V4s snubbered, and the V5s are pre-snubbered. We do still get an occasional misfire, but it is more temp related for us, and primarily on the v3 and v4 units. At least from what we are seeing, the feedback flicker also seems to get worse with temp.