I have an issue with my equinox when I drive it in rain. After driving about 10 km on the highway it begins to get a shake, makes a noise almost like I've lost my muffler or it's bogging out and I lose power. If I take my foot off the gas the noise and vibration stop. Can't determine if the noise is coming from the front or back. Also, after turning it off, the next time I start it I get a message saying"stabilitrak off". Has anyone experienced this? I've had it back to the dealership 6 times and they can't determine what it is. They have replaced the rear end entirely and yet it still continues. I think potentially something electronic getting wet but not sure.