The old movement, the one with more jewels, didn't wind perfectly, as almost all automatic winding micro rotors suffer. It's not a problem unique to Buglari. A lot of micro rotors have winding issues. Thus, some clients would complain the movement would stop even after a fairly active day. I myself, have encountered waking up and seeing the watch had stopped at around 3AM in the middle of the night, when I had walked several miles the day before. Maybe Bulgari created a new movement to counteract this problem?