If you fly straight down, or nearly so, the camera's orientation gets flipped from where it usually is, and it is very disorienting. Normally your head or the top of the yalm is up on the screen, but if you get verticle downward enough then your head/yalm roof is pointed switch to the bottom of the screen.
Yeah I know this is an old bug, but I got in a bug reporting mood over in 14.7 forum and just encountered this old familiar one again so I though I'd mention it.
On a related note, I really REALLY wish my 3t camera would stay where I told it to when I zone. I have to adjust the camera far more often than I really care to because it is not respecting the position I set it in.