We developed a device with a DA14585, an external flash and a CR2025. After downloading our firmware, we measured the current consumption in sleep mode is about 4uA. But after serval days' testing, the current consumption became about 560uA in sleep mode. We checked all the components，and found that this phenomenon is caused by DA14585. we replace a new DA14585 on our board. The current consumption in sleep mode became about 4uA again. what happened? 6 of 30 devices met the same problem. Could you give me some advices?