CRZYHRSGT,
I have silerstars in both my headlights and fog lights for a few months and have not blown a bulb. Maybe you have something wrong with your fog light?
This has been well over a year since I had the problems. Since I changed brands I haven't had any issues. It's quite possible Sylvania has fixed the problem since then. I know there were a few discussions on here back then and Sylvania was aware of the problem. I believe they were calling it a manufacturing defect.