cone gets clogged all the time and the usual culprit. I leave my paint up stairs in heat but when I go to paint I bring down into a cold basement and have no problem, other than being a hack at painting. Unscrew the front part and take cone off clean out and clean needle too. I have to do it all the time as my paints are getting old and have lumps and crap in them, but I'm used to it. Like I said I'm a hack.
for cleaning use the Bernzy solution of Simple Green, Windex, and water. In thirds i think. I make a gallon at a time. Go to BJ's and get a gallon of each and mix up a gallon or 2. Pick your self up a couple of these as they are great to push that above solution thru the gun at the pick up and push thru the cone too. A must have IMO.
http://www.usplastic.com/catalog/ite...3358&catid=875