Jack-1264263

Hello, I've been running the standard track for quite some time and decided to purchase a second hand Scalextric C1388T 1/32 DIGITAL ARC PRO SUNSET SPEEDWAY SET to tinker around with the digital side. One of the controllers only works within 1 foot/12 in of the power base (yes it has new batteries). Is there any type of cleaning or adjustment internally on the controller or is it shot and I new a new controller.