At the risk of sounding like a geezer, I remember back in the late 70's when this was a problem in early designs of mini-computers. Then we used to see single bits get flipped and crash computers from a variety of sources including cosmic radiation and alpha particles that came from the spontaneous decay of elements in the ceramic chip housings. More recently, when I purchased my 2005 Cadillac CTS it experienced a variety of problems similar to this when I would drive through a toll station that was equipped with RFID ID systems. Behaviours including sudden acceleration, engine stalling, indicator lights on the instrument panel going "crazy", On-Star calling for help when nothing was wrong, causing the driver's seat to suddenly drive forward to the steering wheel (making it really hard to steer), etc. At the time the only solution was to pull over, shut off the car, remove the key, open the door, wait for everything to shut down and then restart. After many frustrating weeks of "we can't duplicate the problem" it was discovered that the car had faulty shielding on one of the cables that makes up the in-car network. Once fixed the "gremlins" went away.
The real crime here is that, because the problem can't be replicated on demand, Toyota is blaming the behaviour on attention seeking owners. This bizare response was recently repeated on the floor of Congress by one of Toyota's congressional tools. (I mean duly elected government representative.)