The spot lock on my terrova ipilot doesn't work like it once did. For the first three years it worked great, keeping you right on a 5ft area. Then all of a sudden it would move to far off the spot and try and get you back and over run the spot and continues to do this, making it about a 25ft area instead. I bought new batteries cuz they wouldn't hold a charge as long and recommended by minn kota, unplugged the ipilot wiring overnight, still didn't help, so I bought a new updated version ipilot, still same problem. Navigation, cruise control, and recording all work great, but the spot lock moves boat around so much and quick, if your trying to jig, your gonna get lines tangled. I'm always making sure the boat is at 0 or 0.1 mph before I spot lock but that doesn't matter and I know I never use to be so careful of the speed before when it worked good. Any suggestions?