E70 (X5) shifts to nuetral at speed

[206X]

Hi all, first post and hope someone can help. I have a 2010 48i that's giving me a bit of trouble. This may be a tad long, so bear with me. Initially, the problem started about a month ago. When travelling at an incline and while downshifting, the car with jerk and give a three light error. (abs, dsc, 4x4). Every time the car we started the cold with clear and the car would drive as normal. In fact even after the car with error, the car would drive as normal with the exception of cruise control being deactivated. about a week later before I could get the car into an Indy for diagnostic, a new problems surfaced which is the problem I'm here to ask about. Whenever the car is cold, it will automatically shift itself from drive to park or neutral depending on vehicle speed. The way the car feels and sounds when this happens is exactly like if you were traveling at a low speed and opened your front car door. The truck sat at the Indy for about a week, and he could not figure it out. Initially, the car threw a code for the shifter switch, which was replaced to no avail. The Indy believes my transfer case is bad (showed up in codes) which makes sense for the first problem, but not the second. In fact, he gave up on the second issue. I've scoured the web but I've found no one that has had any similar issues. I have the car back now, and am waiting for an appointment with the dealership. Before they break the bank though, does anyone have any ideas? Thanks in advance!