It's actually baffling, since I've never seen that happen in AH1.
Like, this happens to me a lot of times when I try a high-yoyo during low-speed maneuvering. The plane goes up, kick rudder, and then the nose comes down at very low speed and the plane descends. I use a lot of high-yoyos to catch planes like Spitfires with the 109.
But a single mistake will send your plane in a decent which you cannot recover, the plane begins wobbling side to side. It rolls left, apply aileron, and then it somehow overcorrects itself and sends it rolling to the other side. The only way to stop is by gaining some more speed by a steady decent - except there's no room to do that when you're maneuvering low and slow!
That caused me a lot of deaths in 109s AH2 Beta

This is what you guys are talking about, right?
I'm curious too - do these things really happen in real planes?