P08 Trigger Problem

[wisgro123]

I removed the barrel and receiver from my P08 to lubricate the slide. I reassembled the pistol after oiling and cocked it. I had to pull the trigger twice before the firing pin activated. I cocked it a few more times and the pin activated each time with one pull but the next time I cocked it I had to pull the trigger twice before the pin activated. I disassembled the barrel and receiver to check but didn't see anything out of order. Reassembled the pistol, cocked it and the pin activated. Cocked it again and had to pull the trigger twice. I tried about a half dozen more times but had to pull the trigger twice at random times. Any suggestions greatly appreciated.