If you can’t tell if a floor mat caused your problem you should take a driving class, or quit driving.
The description most of the drivers give really do make it sound like some sort of computer glitch. Perhaps a spurious signal from a passing cell phone tower or some tv repair guy's two-way radio, a nearby garage door opener. Who knows, but it sure is scary!
It's a perfect scenario for high level corporate sabotage or just a single disgruntled employee. The most difficult thing in the world to pin down in a computer is the irregularly irregular glitch that strikes without warning and then doesn't show up again or a long time.