APTUS 75 STRANGE IMAGE

Hi. I've just brought a second hand V fit Aptus 75. I'm using it with a 500 C/M body and i've just started lens testing. I am getting strange files coming through when I shoot at below 1/30th sec. They look as if they have movement as if I shook the camera during the exposure. There is also a strong purple cast across the image. Initially it was just happening with my 80mm lens and I thought maybe there was a problem with the lens, but i've just experienced it with the 50mm as well. Also I managed to get some correct exposures with the 80mm but it then reverted to my strange blurry purple images. It seems to be the same across all apertures.
Does anyone have any ideas on what this may be?
Does anyone have any ideas on what this may be?