Hi @MehrdadHabibi, sorry to hear about this. 
Do I understand correctly that when the battery reaches around 60%, the device just powers off and you can't start it again without charging it for a while, is that the behaviour you are experiencing?
If that is correct, it does sound like there is something wrong with the hardware in the device and I would recommend that you get in touch with your Local support team and they will assist you further with having a repair arranged or inform you if there are any service centres that you can visit in your area.
Let me know if that helps!
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