Intermittent leak down the barrel

[OPBN]

Played the first game of the year in 1-2 feet of snow and had a blast. My usually trusty workhorse however kept getting a slight leak down the barrel. It has a Retro Valve w/lvl10 with SS body, AM/mm rail and Intelliframe. Never had issues with this marker leaking before. It would typically start leaking only after shooting a string of shots and would typically stop if I shot again and/or turned the reg off and on again to reset the marker. I am guessing dirty on/off o-rings in the valve?

[reckid1986]

or the bolt spring may be a little worn down
or a carrier oring could be going bad
clean it up and oil it first then worry about finding the problem

[Coralis]

I've noticed that the level 10 is a bit temperature sensitive , it will be fine in the house and then take it out in the cold and it wants to leak (not that we have a lot cold days here......)