My sat nav has started to shut down after approx 1 hour whilst its plugeed into the car via the usb

Cranwell23
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cable I assume this is not normal any ideas? Yhanks
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@Cranwell23
The GO Discover 7" is a very hungry beast (> 2.4Amps), so must ALWAYS be connected via the provided cigarette lighter charger. Vehicle USB ports only supply .500mAmps so are NOT suitable of any TomTom device2