Looking for some advice. I have owned my PM9 for over a year now. I estimate about 700 rounds through it without any problems. I just happen to take the gun apart today for some routine cleaning. Upon re-assembling it, I now notice I have a problem. When pulling on the trigger it now pulls back to where it should, but then continues a little more past where it normally does. It makes a very gritty/click type sound when doing so. Definitely something wrong as it has never done this before. I have disassembled/reassembled it a few times with the same result. Anybody ever have this happen to them? TIA