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Strange problem Surface2

Hi everyone. My Surface2 64gb has suddenly started spontaneously switching from Desktop to Start Page and back. It's switching back and forth with no input from the keyboard or mouse. I can hear and feel the small "vibration" that usually accompanies pressing the "Windows" key on the bezel. After a hard restart the switching stops for a short time and the "windows" bezel no longer causes a return to the Start Page. I've removed the keyboard just in case the keyboard windows key was stuck, because that is what it seems like, but that didn't help. I use a USB mouse and have removed it as well, but there is no change in the symptom. Wondering if anyone else has seen this symptom or if maybe someone has an idea for me to try.