This is
not the "clicking in the text box causes it to think it has changed" bug. This is something entirely different. So don't close this as a duplicate of that.
Sometimes, the classified system asks you if you want to save ads that have not been touched at all. It seems to "cascade" through part or all of your ads in order, asking you if you want to save each one in turn.
I have a hunch this is related to the sorting algorithm of the ads, and something getting out of order. I'm still working on a solid repro, but I have reproduced this intermittently in 1.18.2.1
This is resolved in 1.18.3.5.