I have a 2010 Cobalt XFE with a 5 speed manual that jumps out of reverse. if I start the car (clutch disengaged) with the shifter is in the reverse position it will stay in reverse, otherwise it will jump out if I go from neutral to reverse. I have a suspicion the clutch is not disengaging all the way when clutch pedal is fully pressed. any suggestions on how to remedy the problem would be greatly appreciated. the car has 50K miles on it, the trans/fluid are all original.