More likely to be fall-out from cheap connectors failing to make reliable contact at the low currents used for many signals in cars.
Motor manufacturers are unlikely to add the cost required for better quality connectors or for electronic solutions.
Wikipedia has a reasonable explanation of the concept.
Yep no doubt that's the reason, not helped by British weather either.
The phenomena was highlighted on my narrowboat when I swapped out halogen ceiling lighting for LED. The household switches coped fine with the current draw from halogens but after fitting LED's and particularly after leaving boat for several weeks unused, many of the switches had to be operated several times to clear contact oxidisation and so have the lights come on reliably given the very low current draw.
