Same issue here (fyi). Over the last couple of days, the sparkly rockstalkers have spoken to me every. single. time. I go near one. If there are 3 sparkly rocks in a street, all 3 will hail me. I'm mining them to shut 'em up. In my case, it's the part of the story about Zille and the stars (I seem to think the sparklies talked to me about other things before this).
i had that too.. i presumed they simply had a psychic link with each other, and expected sam beckett to jump out.... but as it turns out, it was a bug!
Wheeha! Thanks kevbob! I will flirt with as many rocks as possible to get back to that point in the story and wait for their blissful, sparkly silence. :)