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PHOENIX — It’s not the lineups, the injuries or necessarily the system. The cause of the Lakers’ defensive demise is a thousand little decisions gone wrong.

“It comes down to just making the choice,” coach JJ Redick said after the Lakers gave up 132 points in a blowout loss to the Phoenix Suns on Tuesday. “It’s making the choice. There’s shortcuts you can take or you can do the hard thing and you can make the second effort or you can sprint back or you can’t. It’s just a choice and there’s a million choices in a game, and you’re very likely not gonna make every choice correctly. But can you make the vast majority of ‘em correctly? It gives you a chance to win.”

Coming off back-to-back losses for the first time this season, the Lakers (19-9) are ranked 28th in defensive rating in the last 14 games entering a Christmas Day showcase against the Houston Rockets at 5 p.m. PST at Crypto.com Arena.

The Lakers, without any individual shutdown defenders, need a perfectly executed team defense to compete. But 15 different starting lineups in 28 games has delayed some of the team’s ability to build continuity. The Lakers have had their full complement of 14 standard contract players for two games.

Forward Rui Hachimura (groin) and Luka Doncic (leg) could return Thursday. Guard Gabe Vincent, one of the team’s top defensive options on the perimeter, will miss his fourth game with lower-back soreness. Center Jaxson Hayes tweaked his left ankle in the second quarter of Tuesday’s loss and didn’t return.

The Rockets (17-10) limp into the Christmas Day blockbuster with their own struggles. The team thought to be one of the few who could challenge Oklahoma City in the West has lost five of its last seven games. Three of the losses were in overtime and four came against teams currently out of the play-in picture, including Tuesday’s loss to the Clippers.

Led by Kevin Durant’s 25.2 points, the Rockets are a statistical anomaly in the sped up, possession-maximizing modern NBA. They have the third-ranked offense in the league despite being one of the slowest. They shoot the fewest three-pointers per game, but make them at a 40% clip that ranks second, and dominate the glass with NBA-leading 48.7 rebounds and 16.1 offensive rebounds per game.

Houston’s physicality and expertise on the boards could be especially worrisome for a team that still has to consciously choose defense on a possession-by-possession basis instead of consistently living up to a standard of playing hard.

“There’s really no defense, no scheme we can do when we’re giving up offensive rebounds in crucial moments like we are, our [opponents] are getting wherever they want on the court,” guard Marcus Smart said after Tuesday’s loss. “And there’s no help, there’s no resistance, there’s no urgency. … It’s on us.”

The Suns grabbed 12 offensive rebounds against the Lakers on 35 missed shots, an offensive rebounding rate of 34.3%. After the Suns scored a three-pointer by twice grabbing offensive rebounds off tipped balls, Lakers players had an animated discussion in a timeout with Smart was gesturing toward center Deandre Ayton about tipping rebounds. Ayton, who finished with 10 rebounds and 12 points, and Smart ended the timeout with a high-five.

“[I need to] just continue to talk to guys, even though sometimes they might not want to hear it,” said Smart, a free-agent addition the Lakers coveted for his leadership and tenacity on defense. “Especially when we losing, nobody wants to hear it, myself included, but also understand that it’s integral for us to hear those things, to see and to be able to talk to one another and figure it out as players on the court, because we’re the ones out there.”

Redick intentionally built in moments for players to connect and communicate during every timeout this season before coaches speak. The strategy was meant to encourage players to take a larger leadership role. “Championship communication” was one of the team’s three pillars.

Lakers center Jaxson Hayes, left, foulds Clippers guard James Harden on a layup during their game Saturday.

(Gina Ferazzi / Los Angeles Times)

Along with “championship shape,” Redick also asked his team to build “championship habits.” Living up to the mantras is easier said than done.

“It’s not the easy choice,” Redick said. “It’s human nature. … We do it on a daily basis. We make easy choices cause it’s comfortable. Comfortable doesn’t win.”

PHOENIX — Austin Reaves returned from a left calf strain that sidelined him for three games, but the Lakers’ second-leading scorer did nothing to fix the team’s most glaring weakness.

The Lakers’ defense collapsed in a 132-108 loss to the Suns on Tuesday at Mortgage Matchup Center, giving up a season-high field goal percentage (59%) and tying their mark for most points allowed in a loss this season. Led by a combined 17-for-29 shooting from star guard Devin Booker (21 points) and Dillon Brooks (25 points), the Suns easily eclipsed the 56.5% they shot against the Lakers on Dec. 1.

“The theme with our team again is like these young teams that move, we just can’t move,” said coach JJ Redick, whose team is 1-2 against the Suns (16-13). “So it’s like we’re stuck in mud.”

The Lakers (19-9) remain in the top half of the competitive Western Conference, but with blowout losses to Atlanta, Oklahoma City and San Antonio, L.A. is clinging to a plus-1.1 in point differential. They lost consecutive games for the first time Tuesday and limped into a marquee Christmas Day matchup against the Houston Rockets with a multitude of injuries.

Playing without Luka Doncic, who is day to day with a left leg contusion he sustained Saturday against the Clippers, LeBron James led the Lakers with 23 points on seven-for-14 shooting. Deandre Ayton had a 12-point, 10-rebound double-double while Reaves came off the bench for the first time in two seasons and scored 17 points with two assists and three turnovers.

Redick said Reaves was not on an official minutes restriction after his weeklong absence, but that the team would monitor his workload “in real time.”

“It’s hard for me to start, at the rotation that Bron has, for me to stay around that 20-25 minute mark,” said Reaves, who played 21 minutes and 46 seconds. “So [coming off the bench] got brought up in my shooting time. I said I was open to whatever. Definitely felt weird coming off the bench, but it’s basketball at the end of the day.”

Calf injuries, even the most minor, have been major concerns for the NBA since three stars suffered Achilles tendon tears during last season’s playoffs. Reaves, who carried the team during the early part of a season that has featured injury absences from James and Doncic, led the team in minutes per game. His 775 minutes entering Tuesday were second-most on the team behind Rui Hachimura. The Japanese forward missed his second consecutive game with right groin soreness.

Lakers star Lebron James puts up a shot against the Suns on Tuesday night. James finished with 23 points.

(Rick Scuteri / Associated Press)

When asked whether Reaves needed a physical reset after carrying such a large load, Redick acknowledged a break may have been necessary.

Reaves looked out of sorts when he entered with 5:23 remaining in the first quarter. He fumbled the handoff on his first touch coming off a screen. When he tried to thread bounce passes through tiny windows, the ball was kicked away or deflected. He got attacked on defense and gave up consecutive driving layups to Suns guard Jamaree Bouyea.

Bouyea had 14 points off the bench, including a layup over Marcus Smart, who failed to draw a charge call, in the third quarter. While Smart laid in the key appealing to officials, Bouyea didn’t hesitate to leap over the Lakers’ guard and score. The Lakers fell behind by as many as 29 in the third quarter, and Redick quietly waved the white flag with 5:22 remaining in the third when he put reserve forward Maxi Kleber and rookie Adou Thiero onto the floor.

The Phoenix crowd started to file out in bunches with seven minutes remaining when the lead reached 30.

Even courtside seats were empty in the final minutes. Brooks took advantage, sitting in a courtside seat on the baseline as Thiero stepped to the free throw line with 1:16 remaining. Brooks waved his arms as a distraction. Thiero split his two shots.

Etc.

Center Jaxson Hayes left the game with left ankle soreness in the second quarter and didn’t return.. Redick said it was an aggravation of a previous injury suffered last week.