I just had that happen with my car. Had my phone in my pocket, put my car remote in the same pocket. My car doors unlock by have the remote and grabbing the door handle. They would not open when my phone and remote were in the same pocket.
Got in the car and put my phone and remote again in the same pocket and the pushbutton start would not work and the alarm went off, key phob not present showed on the dash. So looks like some interference does happen with some systems.