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ad 1: This behaviour is not normal. Make sure your device isn't on low battery and you don't press the power button too long.
ad 2: I have never heard of this kind of issue. Has the firmware been upgraded by you since you received the device?
Just a short advice: In addition to your post in English, you could provide us with a formulation in your native language (French?). I'm sure, some people here do understand French and at least for them, it will be easier to understand your descriptions, when you provide it in a more eloquent way.
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