Today, I spent a good 2 hours on the range and it was a gorgeous day. So when I was finished cleaning my Browning Hi-Power in .40 S&W I checked for function as I always do. My grip was putting upward pressure on the hammer and when I dropped the slide the hammer fell to half cock. It wasn't a fluke I repeated this several times. I've never noticed this happen before. Any ideas what could cause this? Any ideas on how to fix this or is it time to visit the gunsmith? Thanks for any help. Fred