The Heat are growing frustrated with coach Erik Spoelstra and some are questioning whether he is the right man for the job, according to people close to the situation.

Miami has lost four of their last five games, leading players to privately grumble about Spoelstra for a number of reasons.

The players believe he is not letting them be themselves, that they are questioning his offensive strategies, and that they think he is panicking because he fears losing his job, according to sources.

Contrary to popular belief that Spoelstra is afraid to criticize superstars LeBron James, Dwyane Wade and Chris Bosh, he's been very hard on them.

"He's jumping on them," one source said. "If anything, he's been too tough on them. Everybody knows LeBron is playful and likes to joke around, but Spoelstra told him in front of the whole team that he has to get more serious. The players couldn't believe it. They feel like Spoelstra's not letting them be themselves."