I have a browning 22sa, the gunfails to cock when I chamber a round most of the time. When it does fire it reloads and cycles fine.But when I cycle it by hand most of the time it doesn’t fire. Once it fires I can add shells and it will operate normally. I have tried to cycle it fast and slow it still fails to fire most of the time. Any ideas what it could be? I have dissembled and cleaned it but doesn’t matter.