I have right here on my desk a class action settlement against toshiba for their faulty bulbs, I didnt send it in only because I couldnt find all the information they needed. I have a 56 inch DLP Toshiba and have replaced the bulb 3 times in less than 2 years. I do also own a Toshiba LCD that I havent had any trouble with (knocks on wood) and I love it. Im not sure if its to late for you to do anything but heres a website that might help you
www.DLPLAMPSETTLEMENT.com or call toll free 1-800-894-1766. I have a buddy that bought the same TV as me only a 62 inch and has replaced at least one bulb AND the light engine.