Have you reached out to DD either via here or by calling them about the issue? To have (2) go out on the same side, there could be an issue where water is getting into their housing, or there's an issue with their lamp harness or connector. Aside from a manufacturing defect, the issue could also be with your vehicle harness or connector shorting the light. Again water intrusion would be my first guess.I'm on my third set of sidemarkers, my passenger side marker always seem to burn