I was cruisin over to the local ford dealership with my boy, to look at a sonic blue terminator for him and out of no where it got really hard to shift. when i parked and turned the car off it got easy to shift again. the car sat for about 45 minutes while we looked around. when i pulled out same thing again, but when i got home and turned it off it got easy to shift again. i searched and couldnt find anything exactly the same. i wasnt driving it hard or anything when this happened. so what do you guys think could be wrong?