Mine came 7 years ago and never went away. It starts up every day when I wake up, before I even move (but I don't know what I do before I wake up
). They go for several seconds and come in a packs so it can last for 10 minutes or more. Then it comes back when I read or sit for a while with my legs straight and when I turn on the seat heater in the car.
After 2 years I gave up hope that it would ever go away and got used to it.