Since I drive a Nissan I sometimes have problems locking/unlocking the doors. I have one of those keyless systems and if I have my keys near my telephones it creates some kind of force field that inhibits me from starting the car/locking/unlocking the doors..
The other mention of opening/closing all the doors, including the tailgate is also something I have to do occasional. I will driving away and I can hear the doors trying to lock/unlock every few seconds. I have to pull over and do the opening/closing procedure and magically it goes away. ( magically being a synonym for some kind of pressure switch that is not fully engaged...)..
Technology is great, when it works...