This rate is calculated on the basis of returns for failure within a period of 30 rolling days. The higher quality your products have, the fewer after-sales services you will see. We will also be able to monitor the details of any recurrent problems you face in order to find the best solution. Bear in mind that this rate is strongly related to your test solution. If this is not suitable, then do not hesitate to contact your contact champion who can direct you to a suitable test solution.