I've suffered from the exact same issue with my ES2 + extra battery.
I had to return and get new unit 3 times (!) from my local retailer until I asked for a full refund.
I'm pretty sure it's a shitty firmware issue, because it happened on 3 different brand new units.
I've used latest firmware V1.2.0.
Would be nice to hear from someone if a version upgrade solves this.
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