Problem with my Zeiss 50m and the Mark 3
 

I rented a Mark 3 for the weekend to try it out. there's only 1 lens i'm having problems with in both film and photo mode and that's my Zeiss 50mm 1.4 lens. It's attached to the camera with an adapter. It works fine for a few seconds and then the LCD goes off and i get get "press start stop button" message. Any idea what's going on here?