Please try removing 0.014F capacitor (C6D4 part) on PMIC’s VBAT_BKUP pin on Jetson if you have a soldering iron.
Basically the 0.014F capacitor is keeping +2.5V_AON_RTC signal high for hours to keep PMIC’s AC_OK (pin to indicate that the AC adaptor is present) high when cord is plugged out.
Removing the capacitor help PMIC to recognize AC adaptor plug out soon and plug in the cord shortly after plug out will make PMIC to initiate power up cycle automatically.