I was working the bolt on one of my rifles after cleaning it earlier this week, when the bolt started to intermittently fire on closing. My fingers were nowhere near the trigger, and fortunately it has never happened in the field. Needless to say, this is of serious concern to me, and I know it is a job for a riflesmith to sort out. Any idea what the cause might be? I have a second deer calibre rifle, so this one won't be taken out again until its been sorted.