I have to wait a couple of seconds for reverse to engage, and my fiancé had a problem one day.. Sounded like it wouldn't shift out of 1st but I haven't been able to replicate it.. Ever lol
My BMW tech said all u need to do sometimes is turn the car off and on to reset the comp.
I feel like a fluid change will just make the tranny feel smooth in general and hopefully solve the reverse problem.
I'm just a little worried when I hear it can cause more issues lol. The car only has 83k miles.. Driven short distances the past couple of years.