One of my worst diabetes nightmares happened the other night. It was 10:45pm and I went in to calibrate my son while he slept. He needed a correction bolus and when I tried putting it in the pump, the screen kept getting stuck. I tried pressing every button on the pump and nothing. I took out the battery and put in a new one. When I did this I received my first error message "Button Error." Worried that the end of the pump was near, I immediately called Medtronic. Within 5 minutes of hearing the story he had our replacement pump ordered. Because it was earlier in CA we made the shipping deadline even though at this time it was about 11pm eastern. My husband and I had to whip out the lantus and do some brain taxing calulations to get his novolog correction dose right. I gave him the shots while he slept and he never knew the difference. The next morning he was in range and ate eggs to avoid the breakfast shot. His pump arrived at 10 am and we were good to go. We used it unteathered until about 11pm when his lantus dose wore off. Geeesh.