You should be using Shocker Lube (DOW33) or Sleek as it has been re-branded at SP.What lube are you using for the bolt?
Strip and re grease the gun...then next time you use it in teh cold..set it up and increase teh FSDO setting until it doesnt do it...dont go too far, or you may have a hot gun over teh chronoi got shocker lube which i will use, the blackheart does have a fsdo setting how much am i meant to increse it by? 1-2 or in bits of 5