At times when i take off it seems to jump in gear/ not smooth at times?

I started to have transmission trouble with less than 160,000. Took it to a reliable shop and also got a second opinion. Both places could not believe it and said these are supposed to basically last forever. The shop had a hard time finding one. They did and had a remanufacture one put in. It is now 2023. I have not done a transmission fluid replacement and filter or a flush yet. About 2 months ago. I noticed that auto repair shops have to without me telling them. At times when i take off it seems to jump in gear/ not smooth at times. What do you think may be the problem and should i or a shop do the above? I know about 60,000 on the remanufactured transmission.
Thank you for your help.