2017 Prius 3 Cruse Control/ Dynamic Cruise Control Issue

I purchased a Prius in August 2017 for the sole purpose of driving to another state to care for my elderly mother, usually once a month. It is 1500+ miles round trip. I drive straight through each way. Shortly after I purchased the prius, the cruise control would stop working. It happens on a new leg (either when I started off or stopped for gas and started up again). The only way to fix it is to pull over to the side, turn off the car and wait several minutes before I started it up again. This happened intermittently -- approximately once per trip. Last November it did not work to stop once. I had to stop twice to reset the car.
Additionally last November, the dynamic cruise control stopped working in the middle of one of the "legs". I was going very fast (not braking) and almost smashed into the car in front of me as I kept waiting for it to kick in. It never did. This happened again in December. Again only once per trip.
I have brought the car in several times and Toyota refuses to fix it. They cannot replicate it. Of course they cannot replicate it. They need to drive 750 or 1500 miles for it to happen!
ToyotaCare refuses to fix it also.
I bought a 5 year 50k mile warranty (and am at 35k miles) because the Toyota sales person told me there was a lot of electronic stuff in the car that can go wrong and I don't want to be responsible for fixing it. I never buy these warranties, but I wanted to be safe.
I am very frustrated. I own two older cars that would not be safe to make this trip. I purchased this car new for safety reasons only. And I am not safe in it.
Any ideas would be appreciated. The techs at my local Toyota don't have a clue.

Thank you