Generally speaking, repeated bulb burnouts are caused by a loose neutral wire (usually the white wire) somewhere in that circuit or in the panel itself...provided it's not just a defective pack of lights. Or possibly some kind of voltage spike...are they working on your electric in your neighborhood perchance? I use 16 of these bulbs (from sLowes) in a home made 4 socket system, with numerous Y adapters, and run them 24/0 without any problems in the clone/mom/veggin room...never have had to replace a CFL yet, (a couple of years) and every bulb in my house is one! Might want to have a cool electrician check it out for you...A loose neutral can cause all kinds of problems.