It's fascinating to find issues like this. I do wonder if it's a coincidence or something really is dying/changing on the same day each year and causing search

It's fascinating to find issues like this. I do wonder if it's a coincidence or something really is dying/changing on the same day each year and causing search to stop? We're not quite to the 365/2th day of the year. Today is apparently the 168th day, so it's not something obvious like that. (Like some queue set up to hold 6 months of data, but assumes each month is 30 days, or something dumb like that.) Reminds me of the stories of servers dying every night at exactly 11PM and it turns out it's the janitor unplugging it to plug in the vacuum cleaner.