#define NUM_TEMPS_USERTHERMISTOR0 0

#define EXT0_TEMPSENSOR_TYPE 1       statt 5     und fürs bett ebenfalls Type 1 statt 5

#define EXT0_TEMPSENSOR_PIN TEMP_2_PIN

#define BLUETOOTH_BAUD  115200

#define EXT0_TEMPSENSOR_PIN TEMP_1_PIN

#define CONFIGURATION_H

#define MOTHERBOARD_RUMBA32 3000

#define CONFIGURATION_H

#define BED_MAXTEMP      125 

  #define AXIS4_NAME 'A' // :['A', 'B', 'C', 'U', 'V', 'W']

#define INTERPOLATE_ACCELERATION_WITH_Z 0

You see end stop untriggers 30ms after the message appears. So as a first try increasing #define ENDSTOP_A_BACK_MOVE 4

#define ENDSTOP_A_BACK_MOVE 4

#define DOOR_PIN -1

#define ENDSTOP_Z_BACK_ON_HOME 0

after setting "#define MAX_HARDWARE_ENDSTOP_Z" from true to false the reset/crash does not occur anymore.

#define AUTORETRACT_ENABLED 0

#define HOMING_ORDER HOME_ORDER_YXZ

#define EEPROM_SERIAL_ADDR 0x50  // 7 bit i2c address (without R/W bit)

#define ORIG_Y_ENABLE_PIN 32