I have the 2012 prius 2 with the same concerns. Same vib/ shutter from dead stop. (just at beginning up accer.). I went in to Toyota Dealer and they test drove and mechanic acted if it was new to him. We drove a demo 2012 and it had a quieter start but still minor bump. My car has 8k and it seems more pronounced. 10k its going to be checked again.
