my 2016 jeep renegade latitude will not hold a consistent speed of 75 mph while on flat highway with the cruise control engaged. it is inconsistently shifting to a higher rpm (from 1750 up to 2000 +) in an attempt to regain the cruise speed that it periodically loses - 1 -2 mph. it is more dramatic on a hill or incline - loss of 3 - 5 mph. any suggestions or is it just lack of horsepower from my 2.4 L engine and i just have to live with it??