I did have an issue with an Audi several years ago. My cruise control would periodically turn itself on. They checked the computer, and it was reading occasional faults in the cruise control switch, so they replaced it. The problem continued. Sometimes over bumps, but also sometimes when I would turn on my turn signal. The turn signal and cruise control switches were both stalks on the left side of the column. The dealer read the codes again, and again said the cruise control switch was reporting faults and wanted to change it again. When I protested, and pointed out that it would turn on when I turned on my turn signal, they assumed that I was mistaking the two stalks. (to which point I asked them to investigate why my turn signal was turning on when I activated my cruise control...) It was only after the service manager finally driving it around and being able to duplicate the issue that they believed me. They ultimately replaced the control module in the steering column, which contained both switches, which solved the problem. Not saying that the brakes and gas pedal go into the same control module, but I can certainly see a case where the control module has a fault which is reading the wrong input.