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Thats an odd behaviour. . Cars usually dont go crazy when there is low voltage. The electrical system os regulated by capacitors, transistors, relays and etc. They would require an X amount of voltage to turn on and if there is not enough voltage, it would stay off. Well I can attest to this on mazda 3 and suzuki vitara. Perhaps hyundai designed this car a little different.
 

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when you reproduced the problem, were you able to turn off the car by pressing the push button start for 2 seconds? If the car doesn't shut off, there may be a bigger issue that could mean sonatas being recalled. Cars with push button ignitions HAVE to have a working kill switch.
 
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