@asturur

Follow the instructions on this page, be sure that you enable the internal <Safe Shutdown> switch.
https://github.com/crcerror/retroflag-picase

Can you try to run this on your recalbox

wget -O - "https://raw.githubusercontent.com/crcerror/retroflag-picase/master/install_recalbox.sh" | bash

it must install the following files:

/opt/RetroFlag/recalbox_SafeShutdown.py
/opt/RetroFlag/recalbox_SafeShutdown.sh

/etc/init.d/S99RetroFlag check for the following line

python /opt/RetroFlag/recalbox_SafeShutdown.sh &

/boot/config check for the following lines

enable_uart=1
# Overlay setup for proper powercut, needed for Retroflag cases
dtoverlay=gpio-poweroff,gpiopin=4,active_low=1,input=1

My personal recommendation is to use this version of the script, to use the reset button to reset game/exit emulator/restart emulation station.

https://github.com/crcerror/retroflag-picase

Quick Press on Game, will reset the game only
Long Press on Game, will quit the emulator

""
Multi Switch Shutdown

with advanced shutdown features for more natural behaviour:

If you press restart if emulator is currently running, then you will be kicked back to ES main menu
If you press restart in ES main screen, ES will be restartet (no reboot!), good for quick saving metadata or internal saves.
If you press power-off then Raspberry will shutdown

All metadata is always saved
""