Cruise Control problems of the 2019 Toyota Corolla

There is a severe safety issue with the cruise control. In reading Corolla on-line forums, it appears that it has been a Toyota problem for quite some time � not something specific to my vehicle alone. The first couple of times I had to take it off cruise - as it wasn't safe in any way. The last time I set it well below the desired speed with no other vehicles in view so that I could try to allow it to run its complete cycle. I wanted to see exactly what would happen if allowed to run its course. When I set the cruise control, it sets fine. Then, when I go down a very slight downhill, the engine revs wildly up to 4000 rpm, hangs there for a long while and pulls the car up well over the set speed. Then it drops, inexplicably, to approx. 3000 rpm, hangs for a bit, and then drops down to where it should be - approximately 1000 -1500 rpm and the speed goes back to normal. What good is a cruise control if you need to babysit it? you shouldn't have to take it off because it's accelerating rapidly out of control! I read someone's account of their car accelerating until they came up behind someone else, the car brakes came on, and they were nearly rear-ended by the person behind them because of the sudden braking. It sounds like a ticking time bomb!.

Even on small hills if the cruise control is engaged, the motor will race to 4000 rpms while the car will try to maintain set speed (often goes 3-4 mph higher). As the road levels, the motor will drop down to normal rpm's. I asked the tech at Toyota and was told her husband's Corolla does this too. Acted like it is nornal.

Whenever cruise control is applied and I'm going downhill on the highway, it will accelerate 5 to 10 miles an hour and the rpm hand would rev up during the excessive speed up. I was told this is normal but I don't think so.

When cruise control is engaged and the vehicle is traveling down an incline it will accelerate 5-10 mph over what the cruise control is set at. For example if I have it set at 65 mph it will accelerate to 75-80 mph on it's own. I brought the vehicle in for this twice now and Toyota can not figure out why it is happening. The rpm's will get up to 4000 and once the vehicle is leveled out again on a flat route it hard breaks to slow the vehicle down.