TomTom 740 losing GPS signal

[electech320ci]

Hi
I have a new 740 three weeks old and on two occasions when navigating it has decided to reboot it self and then come back on without being able to pick up any of the satallites.

I then have to do a reset on the device to get it working again.

Is this a known problem or do I have a faulty unit, any advice would be appreciated as I am off to France in a few weeks time.

Thanks

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