I recently purchased the saz 1500D and last night as i was driving, my sub stopped playing and i heard a loud thud type sound right before it quit working. I checked the amp and the fuse were all blown. I replaced them with more and turned it back on. it took a second but my lights started to dim in my car then the fuses popped still. Everything being powered by the same power line is fine there is nothing wrong with anything else. What do you think the problem is. I believe its a factory problem