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My xz1 screen keep turning on by it self for no reason
Does this happen when you get a notification?
Does your phone has a protective case that might be pressing the power button?
Hi @Ioannipan, sorry to hear about this. 
Is this something that has started to occur very recently, or has it been going on for a while? If it started to occur very recently, do you remember if you perhaps installed a new application just prior to this?
Certain applications will turn the screen on when you receive a notification from them, so could you please check if you have a new notification when the screen is turned on by itself?
You can also restart your device in safe mode, so we can see if any of the downloaded applications is the cause of this, as they are temporarily deactivated in this mode.
Let us know how it goes!