Hello welcome to just answer I am master tech and will be able to assist you today.
this is a sign the transmission is failing or a long shot the atf temp sensor is failing.
was the transmission fluid dirty when it was changed and did they do a transmission fluid flush with a machine ?
Did you get my last response to your question?
ok this could be a intermittent issue with the atf temp sensor that is on the transmission case.
I would continue your drive and have this temp sensor checked at the very first opportunity
lets just hope it's a bad atf sensor and not the transmission slipping and going out.
this is the best case scenario right now until this can be properly looked and then a more clear and accurate solution can be made since the facts will be more present.