If the TSB was done correctly, it's a permanent fix. I had mine done at 10K and it's still great at 50K. It sounds like your dealer just cleared the memory and let it re-learn.On my 2018 SE (US made) I had the dealer install T-SB-0152-19 a few years ago. At first it seemed like there was some noticeable improvement. But after a while the original transmission problem returned. These days there is a MAJOR hesitation on acceleration from a slow roll or rolling stop. When I hit the gas there's about a 2-second delay until the car takes off. I've learned to deal with it because like I said everything else about the car I like.