In cruise control mode on highway, when set in the range of 50 to 65 miles per hour, the car sometimes suddenly accelerates by itself and keeps accelerating, even on the flat road. the speed change is fast, in a few seconds. for example, on a flat highway, set the cruise control at speed of 60 miles per hour. if that uncontrolled acceleration happens the speed would keep going up to 65, 70, even more miles per hour in a few seconds. cancel cruise control or step on break would stop the problem. it happened about 10 times over the past half a year (i don't use cruise control that often). my best guess is probably 5% or more of the chance. every time it happened i just cancel cruise control and reset. i consider it as a serious safety problem especially when cruising at 65 miles/hour and it goes out of control while the highway make turns. the car is 2009 honda crv. *cn