This incident was a few days ago, so I cannot remember if any auto failures were active, but I do remember that the aircraft had been flying perfectly with a constant height and maintaining a constant speed. I first noticed something was wrong when the sun suddenly hurtled past the window in a downwards direction, when I switched to “spot” view the aircraft was tail down and became completely unresponsive. I thought about asking on here after I had seen the question about overspeed problems, that is why I left it a few days. I haven’t flown that aircraft since, but others in my collection are all performing properly. The CRJ I have is a handful, but that is because it is extremely sensitive to the joystick and only needs the slightest movements to fly it.