Based on the analysis above, we suggest you send the failure resistor to our company. We will dissect it, if the surface of resistor exists cracks, paint loss, or cahrring in the middle of resistor, ceramic rods with black spots and so on, the failure reason is protective fusing of resistor . If the apperance is normal, but the alloy wire interior of resistor can't connect with cap or alloy wire soldering off, it means the outflow of some defective products occurs in our company.