I've had this happen twice now. The printer completes it's print and then the screen shows "Waiting for user input" while the head starts to move down. First time I wasn't next to my printer and came into the (still heated) hot end buried deeply into my printed piece. Second time I was standing next to it and it did the same thing. I kept hitting the z endstop switch, but it didn't stop. After it broke my piece in half (a problem superglue thankfully fixed) I hit the power switch.

I'm using the config files from makerfarm and they all look fine. (Turn off heat, home x axis, home y axis.)

I can't figure out why it's dropping afterwards. Any suggestions of where I should look first?