I know it's only been two weeks, but I wonder if any progress on diagnosis this has been made? This is an excellent mod and I'm considering buying two of these, one of which I would like the "OS shutdown with reboot on power loss" feature working as intended.
I'd also like to make custom length wiring for mine, which means removing the set it comes with. However, I'm not familiar with the connector used to attach the 12V and GND wires to the board. Would you please share more information about this?