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Hi,
Are you using one bulb or two? Do you use a fan? Also what are you using for a thermostat? Check all connections in the box for corrosion caused by humidity.
Joe
I am currently using one bulb and a fan and a water heater thermostat.  the bulb is a 40 watt appliance bulb.  I noticed last night when I checked the bulb that although they are both Slyvania bulbs they have a different contact spot in the base.  One is all metal and slight rounded and the other has a small flat disk of metal surrounded by a black ring of something shiny.  I did "clean" the base of the first one off.  It was dull looking and placed it in the bator last night.  I had previously did full three week hatches and shut the bator down for a day or two until starting up again.  I have since built a hatcher, using the same bulb fixture and thermostat as the bator and computer fan as the bator, works fine so far, so that I can do stagged hatches.  I have been ordering shipped eggs a dozen at a time to build up breeding stock.  I am working on  LF Blue Frizzle Cochins.  
Carolyn