What does it matter what it is? You want "something" to arise spontaneously. You can test all the water in the world for that "something." When you find it pretty much everywhere, why would you assume that it got there due to this hypothesized phenomenon or otherwise? You would have no idea how it got there.
The truth is, this could be happening on a fairly regular basis, and you would have no idea without replicating it in the controlled environment of a lab. It probably isn't, because it would be a pretty low probability event that would only happen over a very long period of time.