"We just let it get away," said DeMar DeRozan. "It's all on us. They didn't do anything we haven't seen. It's just on us. Getting back, getting rebounds, getting loose balls, stopping our man. That was all on us."
Bargnani finished with 20 points and DeRozan added 17, but the Raptors shot only 40.2 percent and committed 15 turnovers.
Defensively, Toronto was a step slow and the Jazz took advantage by going 13 for 23 from the 3-point line.
"They made a lot of shots," said Kyle Lowry. "We weren't covering for each other. They were making plays skip passes. They knew what they were doing, and we weren't fast enough with our rotations."
Toronto fell behind in the second quarter, when Utah went on a 24-9 run.
The Raptors slipped to 4-16 overall and 1-12 on the road.
"I thought we split apart didn't stay together," said coach Dwane Casey. "... Tonight is the first time I've seen us give in."
According to Casey, his team must "get back to fundamentals, whether it's guarding the ball, rebounding the ball, transition, whatever."