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Giant Fathom E3

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I've recently bought my son this bike for Xmas.
Everytime he uses it, the motor cuts out and the LED light flashes red indicating a sensor issue.
The bike is brand new, has anyone experienced this before
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Can't say that we do. Every e-bike is going to be different. You are better off taking the bike back to the dealer for warranty.

It's also possible that the rear wheel speed sensor isn't aligned properly. If I recall, the motor has to pick up wheel speed for the motor to work. The sensor should be mounted on the chainstay and back wheel so check the gap measurement.
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