The Miami Heat, who have lost three straight, are struggling at the wrong time. The Miami Heat have no one to blame but themselves. A week ago, they were in control of their destiny in terms of avoiding the play-in tournament. Now, they are in danger falling short of the No. 6 seed. The Heat have lost three straight and are 1.5 games back of the Brooklyn Nets. “Losing is what got us here,” Heat coach Erik Spoelstra said. “None of us feels good about it. This is where we are. You are what your record is. You are what…