Volkswagen has announced a recall of its e-Golf in the U.S., due to an issue that could cause the motor to shut off while the car is in motion.

Add to that a Nissan recall earlier this month in which the company needed to reprogram the software controlling the brakes on the Leaf, and a recall on the Renault Zoe (which is not sold in America) for faulty brake hoses.

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One source told the BBC the recalls are likely a sign that due to the increased complexity of technology on EVs, and the relatively short time they’ve been on the market, that there might be a little bit of teething problems as automakers get used to producing them.

“The Volkswagen recall is more serious than the others, but even so I wouldn’t say there’s a fundamental problem,” said Jay Nagley , managing director of the Redspy auto consultancy.

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The Volkswagen recall involves 5,561 vehicles – which accounts for all that have been shipped to the U.S., including 157 that haven’t been sold yet. The battery management computer could misinterpret a brief power surge as a critical problem, and shut down the battery and the motor. An unexpected engine shutdown could increase the risk of an accident.

As for Nissan, 47,538 Leafs built between November 2012 and July 2015, mostly sold in the U.S., are being recalled because a part in the regenerative braking system could freeze in cold temperatures, leading to longer than normal braking distances. A software upgrade should address the issue.