unfortunately they do that in Every automatic car with a "sport-tronic" like shifting interface. They assume you forgot you had it in sport shift mode and up shift for you when you approach redline too rapidly.Bums me out that it won't hold a gear when coming up to redline even in 'manual' mode.
what I hate the most is the 0.5 to 1sec it takes after you press the up shift for it to actually change gear sometimes.
which is why I buy my cars Manual. i can't stand not being in control when I need it.