Today I tried to use Spotlight like I habitually do to open a document without opening all of the folders in which it is nested. I have opened this particular file probably a hundred times over the last month and at least as recently as 2 days ago. The document name is: ETH2050-001-F14-attend.xlsx But when I put in 001 attend, that document didn't list (anywhere within the list) and instead had as its top search item SF1-001-attend.xlsx Now I know why it listed the SF1 file (namely, because it includes "001" and "attend"), but I do not know why it didn't immediately find the file that I had been using more recently, i.e. the ETH2050 file. In fact, I hadn't opened the SF1 file for at least 9 months, if not longer. I immediately reindexed Spotlight and the problem was solved. Now Spotlight brings up the more recent file, i.e. ETH2050. But what I want to know is why Spotlight would forget an item like that. Any ideas? I had thought maybe it was the uptime, but apparently that was only 5 days, which for me is not that long. And still, there have been other times when I've had the computer on that long and it hasn't made that mistake. So I am concerned. And looking at the Console there are no mds messages or Spotlight messages.