I want to add simple loading animation while request is in progress. In simulator it works fine, but on actual device (Vivoactive 4) all view is cleared and black flashing while animation is in progress. I clear and redraw screen so, this isn't partial update problem. In video when i press screen, spinner animation is played, but all view that was drawn is cleared. Delegate responds to actions even on black screen as it should. I found forum post with similar problem, but even after 4 years this still problem.