That's been an ongoing intermittent issue. Essentially, occasionally, the system quits indexing. They are working on a permanent fix, but haven't gotten one together yet that works reliably.
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. “He who fights with monsters might take care lest he thereby become a monster. And if you gaze for long into an abyss, the abyss gazes also into you.”- Fredrick Nietzsche
"We can judge the heart of a man by his treatment of animals." - Immanuel Kant