I had my first (slightly more serious) mishap today. Before every print I religiously auto-home and auto-level before sending the print job - however this time, after that process, I decided it would be a good idea to update Octoprint - before I started the print job. Needless to say, I started it off printing, and fortunately was close to the printer to switch it off, but not before one of the belts came off; it was bashing its head (in frustration at me), on the back of the frame. I guess Octopi had rebooted and reset / lost the printer's orientation in the meantime. It's been so glad, even if it's a scary process, to build the printer myself, as with that experience I managed to get it fixed and printing again within 10 minutes (luckily the belt appears undamaged, and just pulled loose from the grub-screw. 3D printing is so cool, and BigBox is awesome :-D
I've set up my slicer to put the G28 command (you could do G29 as well) in the job start script because I did that a few times as well to my mind just having it do it by default at the start of the job is the most user friendly way.