MIAMI -

LeBron James voiced his frustration with the Heat's slow start on Monday.

LeBron said, "It's simple, first seven games we're playing like **** (expletive) defensively.  It's that simple.  We're not a sugar-coating team.  We came down here and got right down to it.  We're terrible on defense and we have to change that."

The Heat lost on the buzzer Saturday night 111-110 to a rebuilding Boston squad.

Miami hosts Milwaukee Tuesday night.

The back-to-back champs have started the season 4-3.