Most likely you have a torque converter that is going bad. Make sure to check fluid level and make sure full. If not, fill and recheck for jumping. If persistes, next step to have transmission codes read and scan transmission run data for problems. Probably needs to go back to transmission shop. Hope you got more than a 1 year warranty. Sorry. Dave
Good Luck. Please press ACCEPT. Also, If I have been helpful, please leave positive feedback. This is how we are judged. Thank You. Dave.