Problems with 2007 Toyota RAV4 VEHICLE SPEED CONTROL

I bought a new 2007 rav 4 in 07 and have had a problem with the cruise control revving up and down several times in a row while going uphill. i took it to 2 different toyota dealerships and they said nothing was wrong. then i called toyota directly and they said they would make a note of it. first instance almost caused me to hit someone in front of me but i hit the brakes turning off the cruise. second instance caused a cop to pull me over because he thought i was challenging the car beside me to race when he heard my engine and seen my suv lunge forward. a detailed description> cruise engaged at 65 mph and rpm at 2500 performs fine until headed uphill then it will increase rpm to 4000 for about 2 seconds then back down to 2500 then back up then back down and so on till it gets over the hill. when i called toyota they said they don't recommend to have the cruise engaged while going uphill. that's funny i have a honda and it works fine going uphill. my mother has an 07 camry and her cruise works fine. *tr