I made a previous post trying to figure my problem out, but I find more descriptive ways to explain the issue for a better response. So I have concluded it might be fatigue, but I do not know why I am starting to get tired, I have never had issues like this before. What exactly happens is my upper lip comes down and almost 'slides' into the depth of my mouthpiece making a 'duckface' (less exaggerated) embouchure. I hope it is just my chops being used more than the past few days because I haven't played since I got my trumpet cleaned. I have no idea about my issues with embouchure, can anybody relate? I feel really lost and with my issue I can hardly play.