Hello @lafromli, I think I might be a little mad myself if the tech wasn't listening when I told him it hurt and I couldn't put my arm over my head like she wanted. Hoping others with experience will respond. I did find this article that sounds like it may be what you have experienced.

"Dislocation of the artificial joint is the most common complication after a reverse total shoulder replacement. The humerus or arm portion (the socket) can become dislodged or disconnected from the ball (the shoulder blade part)."
-- Reverse Total Shoulder Replacement: https://www.hopkinsmedicine.org/health/treatment-tests-and-therapies/reverse-total-shoulder-replacement

Have you contacted the surgeon or care team to follow up with them on your current symptoms?