S1.010 firmware bug?

My understanding of how the unit works is that there are 2 different boot sequences. The switch between the 2 being controlled by the presence of a USB cable.

When the unit is powered on there should be a if/else loop in the code
(if usb is present load battery charge else load startup.....)

but what happens if the usb is present, the unit starts the battery charge boot but the cable is disconnected before the boot can finish? I would think there should be a checking algorithm to make sure the cord is still attached and if usb were to be disconnected the unit would shut down. but this doesn't seem to be the case. Instead the unit hangs, it can be powered down by holding enter and power but it doesn't reset.

If this is a bug its a very irrelevant one

Besides you can solve it by plugging the USB cable back in (at least that worked for me when I tried the thing you describe)

I had some problems in case of disconnecting while transferring data: The M6 locks with a white screen. I had to power it down using the Enter-key.
So yes, there should be a if/else routine to secure the OS of the M6.