Facing an issue with power on reset

[Legacy member]

Hi, I was facing one issue..while running firmware in my device (stm32f4)in the middle suddenly controller got restarted, when I checked that RCC reset status register and I got to know that power on reset ,but I didn't restart my device only , May I know in which condition controller automatically restart by power on reset​

[TDK]

If you're clearing flags, and all three of those flags are set when the issue happens, all indications are that it's losing power or NRST is getting reset. Could also be a spurious reset due to noise if you don't have a cap on NRST.