I have seen the pressure control solenoid go out and cause this issue here is the location of the solenoid so you can check it out. Check out the diagrams (below). Let us know what happens and please upload pictures or videos of the problem.
Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.