I have had a problem over the years of drift of my satellite locations necessitating my reprogramming their positions. My masts are vertical to a fraction of a degree.Dishes are mechanically solid. Actuator cable is shielded and grounded at one end only. One end of the cable has a capacitor across. I've had this problem in 4 locations with with 7 dishes. Many V Boxes and Titanium ASC-1's; many actuators; many receivers. I'm asking, is this a common occurrence? Or is it something peculiar to me. Thanks.