1. We tested 30 (samples 1-30) sets of core 1:1 before assembly (no epoxy) and 1:1 after assembly with epoxy and cure.Based on the results, the 1:1 before assembly inductance value all passed but after went through our normal assembly process (epoxy and curing), the inductance value of the finished good units went high and some of them are out of our limit already. This is very unusual since we do not change any materials or our process. With the previous batch of cores, we did not have this issue so there might something wrong with this batch of cores.