My front porch lights run on a timer. An automation turns them off every night - and for the longest time, that mostly worked. Then one night I noticed them on when they shouldn’t have been. At 1 AM I was walking past the window and the porch was still glowing, so I turned the lights off myself and promised to look into it the next day.

Looking back at the logs, the story was clearer than I expected: at the usual cutoff the lights turned off, exactly as programmed. Then, a few seconds later, they all turned back on. And they stayed that way until I turned them off.