+1 on this issue (PS4). Needs a fix. Whatever is responsible for rendering the flames on an Inferno Nightmare mount, it's borked. Definitely occurs after extended play as though a memory leak or some such resource bound issue.
+1 for the disappearing navigation guide issue on PS4. Drives me nuts. I think it's happening when returning from a `Queues` mission. Only 'fix' I know is to restart the game.