If it seems to get stuck randomly but works on the next try you could modify the 2nd stage bootloader to restart instead of quit.

It is probably the second gen version of wrover like the wroom-32d/u so it should have improved rf and more certifications.

1.4mA is usually with adc or touch powered on. You are measuring module/chip consumption only right? Although for some reason it is reported as 1.4ma here https://github.com/espressif/esp-iot-solution/blob/master/documents/low_power_solution/esp32_ulp_co-processor_and_assembly_environment_setup_en.m...

Did you try adc_power_off

Because the adc value will hit zero at ~0.1v so it can only tell you the voltage is ≤0.1

Adc cannot measure below ~0.1v