yes I had this problem . some 5er's have a large slide with all the kitchen appliances heavy counters and a heavy sofa or entertainment center all on one side while the other side has a table and 4 chairs and maybe a recliner.
measure the distance from the top of the spring to the frame on both sides and see if there is a difference from one side to the other.
Mine were about 3/4in. dif. if so replace all four springs and I bought springs with an additional leaf. the additional spring capacity should end the problem.