Cruice control disingages when going up hills on HWY at 65 MPH plus. This just started. When it disingages, both the green and the yellow light on the cruise panel go out and I have to wait a few minutes with the dash cruise switch off to turn it back on and get the yellow light again (to allow me to use the cruise). It seems to work again but it shuts off when the engine is under load again up hills. I thought I might have mis-aligned the brake switch because I use an anti-theft device which locks the brake pedal from going down and it kind of forces the brake pedal up to the top of it's travel. BUT, if that was the case, why would the cruise work at all???? HELP!!!!!!!!!!!!!!