Have a Beretta A300 12ga. Only about 100 rounds through it. Has worked flawlessly till last couple days. Just about every time I fire my first shot the gun kicks out the spent shell and instead of loading the next live one it kicks that out along with the spent one. Bolt closes with no shell in chamber. I took the whole gun apart including the trigger assy. It was really not very dirty. Saw nothing wrong in there at all. Reassembled and shot it this morning and same damn thing. Anybody ever had this issue?