Im from Brazil and i bought a Pioneer controller about 3 years ago and with a year of little use the color of the controller has faded and some spots appear in a circle as follows in the images, from then on the spots continue to increase as they multiply with time, today is in this situation and the plastic of the jogweels are dry and sticky just like the plastic of my pioneer hdj -500 headphone that arrived this way, the most intriguing thing is that I never cleaned the controller with any chemical product I always cleaned with a slightly damp cloth, I strongly believe that this controller came with a factory defect, as in the controller finish, it may be that the factory has not varnished the housing to fix the paint on the controller, I no longer know what to do with a view to that it is not my fault this is getting stained that way, I will try to contact the manufacturer and ask for help because that was certainly a manufacturing failure. (translated from portuguese to english by google translator)
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Sorry to hear that -- could you please post the photos?
Unfortunately the manufacturer's warranty for material and manufacturing defects is only 1 year from date of purchase, so even if it is found to be a fault with the process, your warranty coverage has expired.