Is the surround foam or treated cloth? If the former, that's one of the main symptoms of foam deterioration, and they're due for replacement. If the latter, then leave them as is - some cloth surround treatments are meant to be sticky. But neither would cause the woofer to be "out" (I assume you mean it produces no sound). Could be due to a crossover problem or the driver itself. Easiest test is to swap woofers between cabinets and see if the problem follows the woofer or stays with the box.