I bought a second hand custom-s which was barely used and in good condition. Everything works apart from the sustainiac. I have replaced the battery with a new duracell one but it was only working in the lower strings. I raised the height and it worked on the b string also now but it still keeps cutting out on the high e string. The only setting that kinda works is the feedback setting in the middle, the sustain and harmonic keep cutting out. Could anyone help?