So there I was on climb out of Singapore and the 70 starting bouncing, the yoke in the VC was oscillating backwards and forwards - spot view showed the elevator up and down in full deflection. Now I know I was flying a Qantas livery but I didn't order a kangaroo!

I pulled back on my yoke but there was no change - removed mappings in FSUIPC but still no change - ended up having to abort the flight, which is always disappointing. Any ideas as to what caused it?