Just bought pt140 pro. Previous ownee put 100 rounds thru it and decided it was too small for him. Did not clean it. I bought it and spent about 3 hours doing a field strip cleaning. Took it out today and put about 50 rounds thru it. First issue was the slide would lock back like the mag was empty, just pushed down the release andkept shooting. Happened about 5 to 10 times. Other issue. After firing the slide would come back and eject, slide forward and feed bit would not go all the way forward. About 3/8" from full forward. Took home, cleaned and lubed it. Racked the slide about 100 times always went full forward. Took the slide off and put in a loaded mag and pushed rounds out with my finger. No rounds touched the slide lock tab until mag was empty and the mag pushed the tab up. Any ideas?