That would make me start to wonder about the quality of the power in my house. I've seen the power here at my house in the Atlanta area actually drop below 100V for extended periods of time and I could see that causing stress on the ballasts in our CFLs. Our bulbs that have gone out always seem to be shortly after one of those events. (This is incidentally why we also have UPSs all over the house on anything even mildly sensitive)