WNC Super Duty

Hello. I’ve been dealing with a transmission issues for the last year in my 2020 f350. It’s downshifting really into 3rd gear most of the time. Super annoying. It has been to 6 different dealerships. It’s been flashed/updated and valve body has been cleaned. Every time it’s flashed and cleaned it shifts great for about a week and returns to the same harsh down shift. Has anyone had this problem and able to get it fixed? I just refuse to hear from the dealership “it’s just a 10 speed and it’s fine”.