When I had mine, I had a similar problem. The hammer was cocking though and caught by the sear, but the trigger return spring was too weak to reset the trigger past the disconnect. I had to push the trigger forward to get it to engage the sear again. Next time it happens to you, before re-cocking, try just pushing forward on the trigger. You will heaar a clic when it engages again.
Give that a check and see if that is your problem.
