美国采购需求：遥控玩具、无线电遥控玩具、遥控产品、遥控爱好玩具、遥控车、四轴飞行器

I've recently encountered an issue with one of the drones we ordered. Unfortunately, it seems that the unit is not functioning as expected. I would appreciate your guidance on troubleshooting steps we can take to resolve this issue or if we need to arrange for a replacement. Additionally, please let me know if there are any common issues or known defects associated with this model. Your prompt assistance will be greatly appreciated, as we rely on these drones for our operations. Looking forward to your quick response.