NHTSA Complaint #11570071 — 2013 LINCOLN NAVIGATOR

I have had this issue happen 3 times the last couple of months.this last time I was driving in traffic and all of a sudden, the motor started humming like it was in neutral. In just a second or two I thought maybe I hit the gear shift, but I had not. I pulled over and turned the car off. waited a couple of minutes, then started it again. As I pulled onto a busy street, I pushed the gas to go and it happened again. this time i am in traffic where I cannot pull over, pressed the gas again hoping it would go as traffic was coming behind me. The car then jumped and started to act like it was getting to much gas. so i let off the gas again, it then was rolling and i barely pressed on the gas and it seemed to be normal. I drove it to my mechanic and he kept it for a week drove everywhere, no problem. i pick it up and it did the same thing sounding like it was in neutral, then was ok.