Basil_O wrote:
Look in the menu for the "steady shot w/ shutter" option. It is seperate from the steady shot on/ off selection. Make sure that is turned on.
On my A77ii, it is under the gear icon. Just an FYI, I found having it turned on reduced the sharpness slightly on some longer lenses. I have a much higher keeper rate with it off. It's something about the steady shot system making last moment adjustments and moving the sensor slightly.
I've noticed that my telephoto shots are soft if IS is ON with high shutter speeds. Much better result if it is OFF when over 1/500th shutter spped is used.