The infusion set was on the tail-end-of-day-three-just-about-day-four, so maybe it was starting to sour. Or maybe it was going to the beach/playing in the garden/flying kites that tousled the site too much, causing the tubing to untwist just a little bit from the lock at the top of the insulin cartridge.  (Is that even possible?) Or maybe it was just…

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