I'm on the NA server on the XB1 and I get a "UI Error" when I spend too long in my inventory menus, specifically when I'm doing inventory management in my bank and when crafting. I press A to dismiss the error, but eventually it can happen too often that I start missing functions like pressing Y on an item or functions don't work such as trying to press the logout button to no response. Restarting the client helps and even restarting the console, but eventually the problem comes back. I can sometimes also see UI lag. Attached is a screenshot of the error message.
"Loot boxes aren't the problem, RNG is." -Me