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Help Huawei ascend g700-u20power/lock key issue

Hello world!!!
I'm new to android and I've got new Huawei g700-u20 which has some issues with power/lock key. From time to time key doesn't work, when I want to unlock the phone simply nothing happens,or I can see lock screen for a blink but touch screen does not work either. During that time I can receive calls but with delay and screen has slow reaction, I even succeeded to dial a number but when I wanted to hang up screen and buttons stayed black until it hang up it self. Problem with unlocking can be solved by removing a battery or if somehow you can restart the phone, but is this a solution? One more thing I noted, once when I had this problem, I left my phone with almost full battery over the night and when I tried to turn on the phone in the morning battery was drained. That time I noted that phone is heating up near the camera so I guess that this is some software issue and that some of the processes are stuck and make all this mess. Please help, this is all new phone and I can't constantly remove battery or restart the phone.
 
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