It's also wise to check out to help keep the shoulder shifting, even if it is just pendular swing exercises and stretching the arm on to a wall. Since the capsule is becoming inflamed and 'sticky', it makes the joint stiff and tough to shift. This isn't similar to arthritis https://www.theorthopaedicandpainpractice.com/what-does-it-mean-to-have-a-frozen-shoulder/