Driver's seat sinks and changes the seat/mirror field of vision of the rear view mirrors. this "sink" happens slowly (and without notice) causing dangerous blind spot situations while driving and parking. the "sink" began on first day of ownership but i didn't realize it and almost caused an accident because of the change in seat vs rear view mirror position. i am the only driver of suv. male, 69 years old. 180 lbs. driver's seat slowly sinks over time. approximately 2-5" per day. while driving, in all instances. also when the suv is sitting parked and empty of passengers, but sink is slower. dealer and honda main phone complaint site say it is normal. service woman at local betten-baker honda said she has 2016 pilot with the same seat and issue. said the sink is normal. i believe it is possibly a leaking air bladder. cause unknown. lx model with 5000 miles.