Sony Xperia XZ display error

[Action1]

Translation via Google Translate:

The screen sometimes gives an error. Closing the applications is improving. What is the reason. Should I give a guarantee?

Ekran bazen hata veriyor. Uygulamaları kapatınca düzeliyor. Sebep nedir. Garantiye vermelimiyim? 

[Lord_viridis]

Try a backup using Xperia Companion followed by a software repair using Xperia Companion

If it still shows this, contact your Local support for a device evaluation.