There is a possibility that it could be the servo. It is an electronic device after all. First, i would check that your linkage and akerman rack is free from binding and slop, as this can give a false impression of a servo not centering. If it is indeed the servo, please send the servo into us with a copy of your purchase receipt and we will either repair or replace the servo for you. If you need to send the servo in, follow this link: http://www.hitecrcd.com/pages/support/102