I have a Donkey Kong Cocktail system that will start scrolling the image upon startup. I am able to set it and center the image but it will slowly start moving again and speed up until it is set back again. I checked the EPROMs and the connections and everything looks good(to me) Any advice on how to resolve this issue? The movement is mainly left to right although I have seen it revert to right to left. (This is the 4 board system)