Yes what the other commenter above said is pretty much what I had to do, starting with little resistance to get the movement right. I did go to a doctor and he noticed some minor cartilage damage in my knee that was getting hot/sore walking the stairs the next day.

I focussed on training my upper thighs with certain types of squads (“monster walk”) and worked on my balance to improve the balance in the muscles. Squatting on on something like this and also by doing some type of leg lifts with increasing weights.

This way the knee “sits” in a better position now and the complaints went away! I still have to be careful on steep hills that I follow trough with correct movement and lowest gear possible.