I apologize if there is already a post on this topic, but I get zero hits searching in the forum. I, like many others, have experienced the rage of clearing mines. In a recent game, I was wondering why my units were not engaging the mines, even though I had numerous scouts present and within range. Upon zooming in on the mines, I noticed that they were not actually being pulled out of phase by my scouts, they were pulsing back and forth between phase and regular space. This was further evidenced by my fighters, who would turn to engage, and almost immediately turn back to the hanger. One can also see this in action as one right clicks on a mine and it issues either a move or attack order and alternates quickly between the two.
Further Info: I was playing as Vasari, and this particular example was against other Vasari mines, and I cannot remember off-hand seeing this happen against TEC mines and I have never encountered Advent homing mines.