Note: The printer I'm using is somewhat older, so maybe newer models/firmware behaves differently?
The issue: I was adjusting the bed (moving the printhead around with the motors turned off) and wanted to print a testfile. Apparently the file didn't contain the instruction for align-to-zero, so the printer immediately crashed the head into a wall.
Not thinking too clearly, I simply switched it off (instead of hitting the reset button).
At the time it was still connected via USB to the notebook I use to transfer files (I prefer to print from the internal memory).
Because it is connected to a powersource, the electronics apparently is NOT reset (display still active and usable) even though the physical power button is switched off and the mechanics is unable to move.
So when I switched it back on, it immediately tried to continue the print. (This time I hit the reset button.)
IMO, when I turn the device off, it should either completely shut down (making it impossible to transfer files without turning it on, but I think that's a small loss), or at least when it is turned back on it should do a complete reset, especially clearing out the instructions cache.