Share your experience!
After nougat update of my xperia xa ultra, I started having problem with the ui, like the screen freezes and suddenly a message will pop up saying "system ui has stopped working". At first I thought some apps may be the cause of it, as I try to find out. But it turns out that every time I accidentally swipe my figers to enter into one handed operation while running some application from the background, that causes to freeze everything from the screen, luckily the power button helps refresh the system after a few clicks, and when this message pops up that the system ui has stopped working, tap on the wait button, not to force close it, you would be having a bigger problem when you force close. Hope this message helps, and hope developers could fix this.
@jmiczdoes the same thing happen in safe mode? if yes, then the issue is caused by one of the apps you've installed. if it persists in safe mode, your next step would be performing a software repair using Xperia Companion.
Surekli bu hatayı alıyorum sim kartini cikarip takmayana kadarda herhangi bir sekilde duzelmiyor. Ne yapmam gerekiyor yardimci olur musunuz?
I am taking this error and I am not going to fix it any more until I remove the sim card. What can I do to help you?
GT
this is going to be sad to say but... i dont have the ''wait'' button thing on my phone 
My Xperia XA dual phone have UI system stopped problem, this problem only with owner user