Ford Fiesta car won't start

not sure where to start, But periodically the wing mirrors won't come out ( i know about the stick inside car regarding wing mirror) but the car door has opened but then the car won't start its dead. Then after a bit it will decide to start but the radio has turned itself off and the milage counter has gone to mpg even though turning the car off showing milage. The other day the door wouldn't even open but an hour later all opened and started but again the radio turned off milage reader back to mpg as though going back to factory settings. I've had the battery checked and are saying it fine, i've tried the spare key but again today wing mirrors didn't come out on opening but door opened and start but radio off and showing mpg and not milage as it was on when i turned car off. Any ideas