Just bought a new ruger bearcat SS .22lr and took it to the range today. After 50 or so rounds the ejector seems to get harder to push by 100 rounds the ejector would not move is this normal ? Took it home and gave it a good cleaning now the ejector moves ok. I thought since the ejector was made of aluminum the heat may have played a part in the problem. I expected to shoot several hundred rounds without any problems. Has anyone else experienced this problem ?