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@Ceni Does this happen in every app? I think you should try a simple restart first.
Hi @Ceni,
I'm sorry to hear about your phone.
As @alexdon wrote, does this occur in all applications in your phone or in some specific apps?
If you for example start a Youtube video and make it full screen, can you still see the back, home and task buttons on your display?
If you are able to see them at all times in a full screened Youtube video, I'd recommend that you reboot your phone in safe mode to see if a third party application is the cause of this.
Let us know how it goes!