The Suns have been knocked out so often that they appear like a team that is numb to the pain. The season is a 43-loss pileup crash, but the worst nights are hard to differentiate because the extreme losses have become frequent. Five times in the past 15 games, the Suns were obliterated by at least 25 points after Houston whacked them 111-81 Wednesday night at Toyota Center. The Suns keep saying the right things about improving and fighting amid a lost season but their words hold up like sidewalk chalk in a rainstorm. A 43-38 Suns lead midway through the second quarter was washed away Wednesday with a 20-2 Rockets run to close the first half. That run became a Houston marathon with the Suns getting outscored 42-13 over 141/2 minutes of play. The Suns’ collapse began when Goran Dragic, the most despondent Sun about the 22-43 season, drew his third foul to give Houston the first points of the run and to send him to the bench. The Suns went from shooting 58 percent for the first 18 minutes to missing 22 of their next 27 shots. They made more turnovers (eight) than shots (five) during the 42-13 Houston stretch. “Our guys have to compete and I didn’t see that,” said Suns interim coach Lindsey Hunter, who is 9-15. “It’s very disappointing, very embarrassing, unacceptable.”