Glock 19 Hard trigger fix question

In this video I show my gen 3 G19 that started having a very hard trigger. The gun still fires and operates fine, just with a hard “clicky” spot at the end of the trigger pull. It feels like it comes up on a hard stop before firing. It used to be smooth and clean. It was hand polished to get a nice trigger pull years ago. Please HELP me fix this issue if you can. Especially if you are a Glock armorer or have seen this before and know what I need to do, please help me fix this. Thank you.

John's Hand Loading

John has been shooting since he was a kid and is now a middle aged man. He likes shooting rifles and handguns, reloading, bullet casting and the outdoors. He believes in God, freedom and a good sense of humor.