NEW YORK (TheStreet) -- Korean cars are leaving competitors behind when it comes to quality, a leading report on automobiles says. 

On the other hand, Japanese brands are slipping down the rankings, falling below the industry average for the first time in 29 years.

That's according to the latest J.D. Power Initial Quality Index report, which has just been released.

The study measures problems experienced by vehicle owners during the first 90 days of ownership.

In terms of nameplates, Porsche (POAHF) ranked top for the third consecutive year, followed by Kia and Jaguar (TTM). Infiniti was one of the most improved brands in the study, coming in at number 5.

Though vehicles are becoming more high tech than ever, technological advancements continued to cause problems for the industry.

Entertainment and connectivity systems provided consumers with the most frequent problems for a third consecutive year.

Voice recognition and bluetooth also caused regular issues for consumers.

"Smartphones have set high consumer expectations of how well technology should work, and automakers are struggling to match that success in their new vehicles," said J.D. Power's vice president of U.S. automotive quality Renee Stephens.

"However, we are seeing some OEMs (Original Equipment Manufacturers) make important improvements along the way," Stephens said. "What's clear is that they can't afford to wait for the next generation of models to launch before making important updates to these systems."

An OEM is a company that brands and sells another company's products under its own name. 

Overall, initial vehicle quality has increased by around 3% since last year. BMW's Rosslyn, South Africa plant ranked the most efficient in terms of assembly line quality, producing models with the fewest malfunctions.

The plant manufactures the BMW 3 series.

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