Recreational Vehicle Lpg Tank Valve/gauge problems of the 2013 Chevrolet Equinox

I have had my chevy Equinox for a year now and I have been the only owner of said vehicle. When driving down the road does not matter the speed the collision warning light will come on and the car decides to slow down or come to a stop. I have checked around the car when it happens to ensure nothing is stuck around sensors however nothing. I have taken it to three different dealers and I am told the something "there is nothing wrong with the car and bring it in when it happens again and that the vehicle is not suppose to stop", that is why I brought it in. I have also been told there are no recalls. Then there is the other factor that the radio updates or shuts down when it feels it has worked to hard . I am usually in my vehicle for about 25- 30 mins both ways. Then there is the tire pressure gauge that thing will tell say the tires are one pressure when they are not I have used a tire guage electric and manual, they read fine but the vehicle will come up with the tires being off where half the vehicle is higher than the other or all four are off nevertheless all have been checked and verified by a gauge.