Slow operation of the top can be attributed to many things. I would check for the obvious leaks at the cap of the reservoir and at the cylinders. It may be that if you have developed a leak, the reservoir needs refilling. The cylinders should also be lubricated occasionally so that they slide freely in and out of the seals. Keep in mind that the oil will become thicker with the cold weather, so the raising and lowerng of the top will also slow down. Good luck! Sal