NVMC cause the chip reboot during erase and write the flash

[weizhen]

I want to use the flash to store some values, I try to use the NVMC like the examples, but it cause the chip reboot. why it cause the chip reboot, and how can I fix it?

[Vidar Berg]

Are you using the Softdevice? Application does not have direct access to the NVMC once the softdevice is enabled, see Memory isolation and runtime protection and System on Chip resource requirements for more details. Instead you can use the softdevice flash API.