In one of Springer's journals, I have responded to a major revision. Since that I'm keenly tracking the progress of my manuscript. About every 10 days or two weeks, the revise date is changing, however, the manuscript status hasn't changed "Under review" I am waiting for 4 months. And I think it is very very long time. What should I do in this case. By the way the first decision was after 45 days.
Looking eagerly for your contribution.