Not shifting properly… sounds like your car is “talking” to you. Your vehicle could be experiencing a dirty transmission or the trany fluid is low or dark. Do you hear a whining or loud grinding noises? Does your vehicle pull while changing gears?
A dirty transmission could cause the gears in your vehicle to not shift properly. If the fluid level is full (or close to it) you will need a transmission flush to remove the buildup of dirt.
Noises and jolting issues could indicate a bigger issue. It is best checked out by an experienced auto mechanic who understands the electrical system.
As usual, getting it fixed now could save you additional repairs down the road.