I bought this product, the "Razer Laptop Cooling Pad," about 2-3 weeks ago. Over the past weeks, I've noticed some issues that I don't understand, and I would like to ask for your help. When the cooler is in operation, it emits high-frequency sounds in the range of 500-2500 rpm. I checked the filter, and it's not dirty, and I am using it as its intended with the proper frame, not overworking the fan. What can I do to stop the noise? Thank you in advance for your responses!