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I have identified the issue.
In order to protect the usb c port in the Max 3 I installed a magnetic usb-a to usb-c plug in the port for the purposes of charging it.
When I remove this I have found the device powers off correctly .. (i.e. no led in the hardware power button flashing in power off state)
Also when I install a usb-c usb-c magnetic connector that brings out all 20 pins .. the issue does not occur.
Obviously the usb-a to usb-c plug is shorting some of the usb -c pins in the device .. I am not fully familiar with the usb -c standard but I imagine that there is potential for
the sinking of sufficient current to drain the battery in the powered off state to drain the battery in the way I described.
Has this sort of issue been identified previously? If so what is a proven fix which will allow me to use a magnetic connector for charging (with the intention of reducing physical wear on the connector)
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