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Once it cools, it should function properly again. A lava lamp may overheat in eight to 10 hours, depending upon the bulb and brand of lamp. Use the lamp for less than eight hours at a time for best results, allowing it to cool to room temperature before using it again.
DLP lamps do tend to age after a few years, with the length of time depending on the brand used and how many hours you have your TV set on. The more the lamp is used, the more the mercury vapor arc tube's electrodes wear out. What you'll notice is that your picture is dimmer or that you don't get any picture at all.