We are using the STM32L432KC and we are facing problem to start the MCU.
To sum up the situation :
* The MCU can't start-up after a power off.
**In order to reproduce the case you can use the nucleo L432KC -> you have just to flash the MCU after that remove and put back the USB -> you will see that the MCU don't start-up in every time the power goes on.
* The workaround of this issue was the use of the IWDG which is clocked from the LSI. The LSI reset the MCU until the MSI start.
** We have checked that this workaround is working in the nucleo L432KC but unfortunately it doesn't work in our board and we are facing the same issue.
* We have the same board (PCB) with an STM32L0 : The MCU start in every power on.
We would like to have more information about this issue and to understand why the MCU can't start.