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Question: what i the problem and what is the solution

Ron W. -

intermittently, when I slow down to stop, going 5-10 mph, the engine revs [sounds like reving] and the brake pedal feels as if the power brakes do not operate - I cannot stop the car - a few times it has happened when i have stoped to park at a parking place and the curb [ an unmovable object] stops the car. Once in Scottsdale, I hit the car in front of me - very slightly, causing no damage with no accident report by either party. The next day I took the car to Scottsdale Jaguar who checked the brake system only and could not replicate the stopping issue and returned the car to me. Then in Las Vegas, I hit a car stopping in the left turn lane - same symptoms almost no damage to either my car or the car in front of me. the next day, i drove the car to Gaudin Jaguar and thay also are unable to replicate the issue. Now I have had two accidents and thankfully, in the second accident there was a car in front of me OR I would have continued to move into the intersection and could have been broad sided. I need to find an answer. One person has said that it is a trottle problem. Another said that it is a brake pedal micro switch problem. I need your best advice on this issue. Also, how can I replicate the issue so that Gaudin Jaguar can document the issue and fix it. Thank you for your help.