Since I've had my seat I've had this issue but I lived with it, today I investigated a little more and I've found that my right seat and left back panels are really slow. When testing the others I can move the slider as fast as I can and they follow but these two do not, they are very slow to respond, they move the whole range but it maybe half speed and they feel weak. I've checked that nothing is binding and everything appears to move freely.
Any ideas?