LeBron is losing some steam lately & his play has been less than stellar compared to his normal standards, but many of these recent losses for the Heat lie mainly on Chalmers, Allen & Battier. All 3 have been terrible providing little to no scoring.
Allen - 25.2 Minutes Per Game (5 games) - 8 PPG
Battier - 17.8 Minutes Per Game (5 games) - 3.2 PPG
Chalmers - 28 Minutes Per Game (5 games) - 6.2 PPG
Also Spolestra's no coaching ass should be utilizing the other players on his bench. Plus Miami made no other significant moves after the trade deadline while all Heat's major competitors have improved by adding additional players to their roster.