Have put about 400 rds through my pt-145 and cleaned thoroughly after each range trip. This last trip, I had multiple failure to return to battery issues. The slide would slow to the point I would already be about to pull trigger again then slide would close. Sometimes it would not close at all without a rapp to the back and sometimes not feed next round completely. I could not find anything abnormal when taking it down to clean but slide was difficult to remove.This was the first time with problems. I am hoping it is something simple but am stumped. Cleaned, reassembled and slide seems to rack fine. Any suggestions? Any help greatly appreciated.