When I am using my SP3 in bed and I turn onto my side and have the Surface tilted, more than around 30 degrees, the entire Type Cover disables including the backlighting and touchpad. Sometimes it takes more tilt to get it to disable than other times. I think that this might have to do with the fact that the keyboard disables when you flip it behind the Surface 360 degrees. My autorotation is disabled. When you tilt your setup sideways, does the Type Cover disable? Thank you.