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NRF52 SDK12 hardfault if secure bootloader present

Hi! For a custom board, I have my app working ok. So I wanted to add the dfu secure bootloader to my project. I Had no problem to do that, both app and bootloader start ok and I could download the software package ok.

BUT: near to a minute after de app start, it crash. In debug I get: FPU_IRQHandler, inside of "Default Handler" at "arm_startup_nrf52" [UPDATED]: See the picture below.

If I erase the bootloader (no need of downdload the app again) all works fine [UPDATED]: I tried it again, and I was wrong.

I'm suspecting a memory issue, maybe in ram? But I had no succed in found a solution.

image description Help please!!!

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