This has happened to three or four of my insert bolts. I just took the insert off, laid it down on something nice and cushy (so it wouldn't get scratched) and scraped off all of the old epoxy from the back side. I then lightly sanded the bolt and the "flower" (that's what I call it anyway) that it is connected to to get the rust off of it, shot it with a little primer to prevent further rust, then after it dried I JB Welded it back down to the insert in the same location as before. It's worked, so far, for a few years, and the only ones that have come up are the ones that are still held down by the original epoxy. The JB Welded ones haven't moved.
"The major difference between a thing that might go wrong and a thing that cannot possibly go wrong is that when a thing that cannot possibly go wrong goes wrong, it usually turns out to be impossible to get at or repair."
-Douglas Adams, Mostly Harmless
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