If you have a phone with slow motion recording. Record a few failures and post them. It should be clear what type of failure you are experiencing. If it is always the same type of failure describe the position of the slide, fired round and unfired round. There are many separate processes happing in a short period of time when firing and reloading a round.
I have found this to be one of the most helpful things when troubleshooting. I take a slo-mo video and scroll through, frame by frame. You can often see exactly whats going on.