2008 Pontiac Grand Prix Transmission Flutter?

Have a question on my 2008 Pontiac Grand Prix and I want to know if anyone else has had this issue. It seems like the transmission will do this slight "flutter" in between shifts once in a while, mostly at higher speeds or when wanting to kick it into a "passing" gear. Fluid and filter I believe are still factory, so I don't know if that could correct it, or is there another issue? Hopefully not. Saw a video of a Pontiac Grand Am that does the same thing. Any feedback, let me know. Thank you! Grand Am video :    • 2002 Grand Am GT 4T45E transmission flutte...