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Hi @glaucommando, I'm sorry to hear about what you are experiencing with your Xperia XZ1.
Just as @uliwooly are stating, based on what you have already tried I would also recommend you to contact your local support team for more information about how to send your phone in to an authorized service center and get it examined.
I'm really sorry about this, but please tell me if there is anything else I can help you with.