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A picture of the brass that got stuck will tells us a lot. As it is, it could be any number of things.

Stuck/broken extractor. Spring missing from under extractor. Bad ejector or ejector spring. Gas system not fully cycling. Improper buffer or buffer spring installed causing a short stroke condition. Cracked gas tube.

Need more info.

Try an extra power spring for the extractor and/or an Oring over the same spring. Previous poster suggesting AR15.com is a good start, also search for fte and ftf with ar15s. My experience is the extractor is a good place to start.

When a barrel nut is not 'torqued to proper tight' even one round can cause the barrel nut to rotate pinching the gas tube. The proper fix is to take the barrel off of the upper receiver and reinstall with a new barrel nut and torque it properly with the gas tube unpinched right through to the bolt carrier.

I had a guy bring me an AR which he wanted to mount a piston kit to because his rounds were not cycling right. Turned out his gas tube was pinched by a loose barrel nut. If the barrell had roatated further (if the tube was not holding it from rotating off) he could have blown it up in his face!. I used a brand new barrel nut to reattach the barrel when mounting the piston kit.