Hi, we have the same Problem. My NX3000 and NX 3000D both goes protect mode. It so expensive to return to behringer so what i did is to open the unit and checked everything. There is no problem all parts except on the IC controller or Chip that controls everything. It need to be change. So, there is no IC replacement only behringer can produce that parts but still, they havent replied my email regarding that parts that i need to purchase.