2008 aspen transmission problems
 

I have a 2008 aspen 4.7 .the car went into limp mode and codes p075 and p0868.i changed the trans solenoid shift pack and filters and put new fluid,car drove good for a few day then did same thing again....turning car off and on a few times normally makes it go away and it will drive fine for a day but will do it again....what could be wrong...help