Headlight Switch problems of the 2014 Mazda CX-5

Headlights, low beam. I've had my Cx-5 touring since I bought it new in July 2013. I always noticed how the headlights, when turned on, are very bright for a split second, then instantly dims down lower. This happened all the time the first 2 years driving it. I knew it had the latest technology for road adaptive headlights. So I thought it was the way it should work. About 2-3 months ago, they started to come on, and stay bright constantly, until I turned them off then on again. Now, they would stay bright for hours if I don't touch the headlight switch. Then when I do switch them to another setting; they would go dimmer and stay there. After a few times doing this, I took it to the dealer to be checked out. After a thorough inspection, the mechanic reported that these (factory) headlamps are supposed to turn on high then low in a split second. This does not sound logical to me, especially since I spent 15 years working in the automotive industry (for oem suppliers, and I also worked directly with Ford, Chrysler, Mazda, others) for a few different major electromechanical vehicle oem components. Unless there is something I don't know about these headlights, why would they do this split second bright then dim for the first couple years, and suddenly start staying bright from the time I start the car? they now (erratically) stay bright as long as I don't touch the switch arm. When I do, they come on bright for a split second, then dim down. This condition is erratic, parked, in motion, idling etc. , I have noticed on poorly lit back roads, that the headlights (when "low" were not adequate to see the road, and is a serious road hazard. I often turn on the high beams to compensate for the dim headlights. I can send the dealer inspection report upon request. Thank you.