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Your brake (light) switch is broken. This is the switch that detects pedal pressure on the brake. If it isn't working, cruise will be screwed up, and given your description of the "restart" every time you push the button, it's probably stuck closed, so the car thinks you are stepping on the brake pedal.
I had one stick open on my old M3, and when THAT happens, when you step on the brake in cruise mode, the cruise control doesn't know it, and tries to speed the car up to compensate for the braking slowdown! Takes you by surprise for a few seconds, too -- step on the brake and the dang car speeds up!
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