Solo flight, I think it might have been caused by use of the Live button in replay. I was trying to get an A320 landing just right and so kept using the replay to jump back to final, but after a few of these, the pitch control completely stopped - I could still bank left and right, but I had no control of the angle of the nose whatsoever.
Sorry if this is a repost by the way.
Crashed, and nearly threw tablet out the window.