That's very strange, I don't know what would account for that. You don't have them on dimmers, or worse yet the old fashioned diode dimmers that give half wave AC do you? That will kill a CFL very quickly, as will a lot of short on times as the startups give the most "wear" to a CFL.
I've not had any issues with the bulk pack CFLs from Depot / Lowe's / Sam's / Costco. See my other post.
I've also used six little 9W CFLs to light the inside of a 40' cargo container in the frozen northeast and had no problems with those either, even when the ambient temp was below zero. Granted at those temps the CFLs do take about 90 seconds to reach full brightness, but after that they are fine and I have had no failures there either.