Thankfully instances of effects malfunctioning are extremely rare. However we are aware that it is possible. We have a procedure so that we are made aware of any potential problems and we can then make the situation right. First, please request a product report form, fill it in with as much information as possible and make sure you include the batch number. Please send the form to the person stated on the form. Ensuring that you receive a quality product is extremely important to us. We rely on end-user feedback to maintain the exceptionally good reputation our products have gained over the past 40 years.