It's definitely that. My 2007 Civic doesn't account for incline when doing cruise control. It has some sort of lookup table that says, "When the owner sets me

It's definitely that. My 2007 Civic doesn't account for incline when doing cruise control. It has some sort of lookup table that says, "When the owner sets me to 65 miles per hour, I go at this RPM." If I keep slowing down because I'm on a hill, it downshifts a gear and accelerates hard until the car goes back up to 65 miles per hour. Wash, rinse, repeat. I always disabled cruise control on hills because of it. My fiancee's 2014 Nissan Rogue accounts for hills with cruise control, and it never has these intervals.