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That's frustrating.
My old M900 used to completely cut out intermittently and it turned out to be chafing wires where they passed around the steering stem. When the bars were straight, the wires made contact and it ran fine but, as soon as you turned them more than about 10°, everything went dead. There was no obvious external evidence of this unfortunately but you could just feel the break through the insulation.
I don't think this is a unique problem so it might be worth checking this area on yours.
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