I am looking for a little help on my LnL AP. I bought last year and have loaded thousands of rounds on it. About 2 weeks ago the shell plate started sticking. I'll pull the handle it will cycle to the next station then randomly the shell plate will jump a 1/4 inch or so. It doesn't happen all the time it's completely random. I removed the shell plate cleaned it and reinstalled and again randomly it jumps. Any suggestions? As always thanks for the help!