Ben,
on the winder lever item...... look in the manual on page 24....right hand column..notes.... the first one. .....
it says....
Notes:
• A motor integrated into the Digital-Modul-R automatically cocks the shutter after each picture. Alternatively, for example to save battery capacity or avoid noise, you can also do this manually using the camera’squick wind lever. If the quick wind lever is in the ready position, i.e. folded out, the motorized drive is deactivated.
BTW: sounds like we are back to a dirty lens or dirt in the camera somewhere