'05 4.4 X5 Transmission issues

[x5GuyInLA]

I have about 1300 miles on my X5 and I notice that when I have it in sport mode and accelerate quickly, sometimes the RPMs jump up really high without a corresponding increase in acceleration. I also notice in sport mode that sometimes when I accelerate but don't continue stepping down on the accelerator, the RPMs rev high for a few seconds(a lot longer than would seem normal) before coming back down, almost as if the transmission is slipping. I also notice that when I'm driving in regular mode and want to pass someone, I have to floor the accelerator in order to for the transmission to shift down, otherwise it just seems to accelerate slowly in whatever gear it is in. I was wondering if anyone has had these issues with their X5. I've heard of a transmission software upgrade, but when I called the local dealership, they said that there is no such thing...all they do is see if there is a problem and just reprogram it. Maybe I'm just being paranoid, but any info would help. Thanks.