I've had problems from the beginning with my DG-280 motor. I started out with a
Mercury II and it would work about half the time. Just got a Viewsat MaxHD and it works even less frequently.
Getting tempted to take the motor apart and look at the signals to see if I can see the problem.
Only about 25' feet of RG6 cable, only about 1.5 ohms total resistance in the cable run.