If your '07 has a dipstick for the Auto Tranny -- take a good look at the color, condition, and level of your ATF. (I'm not sure if the '07 is one of the 'no service' trannies or not) Remember, check it warm and in park...
If you're not overfilled, stop in at your local parts place and get a pint of the Seafoam product "TransTune"
and add about 1/2 the can to your tranny, and take at little ride (~15 minutes) to assure that it gets fully mixed into your warmed tranny fluid. Plan to service your tranny fluid sometime in 2011 & dump the other half-bottle of TransTune in before your service (at least a filter change)... I won't ask how old your tranny filter is
Sounds like you may be past-due for a tranny fluid change. The Seafoam TransTune will help to dry-out some of the moisture that's building viscosity in there as well as kinda "clean things - up" a bit --