Are you saying it won't reset at all or it no longer "clicks" when you reset the trigger.
If it doesn't reset at all, take the slide off, if you have a mag disconnect insert a mag and pull the trigger. Then push the trigger bar loop over to the right (out from under the sear) and watch the trigger bar loop as you release the trigger. Is it sliding back under the sear? If not, the loop may need to be adjusted. If it simply doesn't click, that's OK.
Do you have the newer slide stop with the ridge on the inside of the right edge of the stop? That's supposed to enhance the "click" of the reset. If not, no big deal but don't expect click. You could bend the trigger bar to put more tension on the loop to the right, but I would strongly recommend against it because unless you really know what you're doing, you could mess up the trigger bar and render your gun unshootable.