Be careful when updating to ui8 make sure that before you do the update you have your side button enabled to power off your phone.
The issue I had was directly after the update where all the features are listed. After clicking more (which is the only option) the phone went to a completely black screen with and upside down green Android at the top left and only the back and accessibility buttons at the bottom which did not work and shouldn't have even been there as I have swipe enabled. Any app that would come in as a pop-up if I clicked it it would show the opening page to that app but stay frozen. I had to restart the phone to get rid of this issue.
Other than that no problems so far.
