Most likely you have a defective lamp or it is near the end of its life. It's also possible that the high voltage power supply is going out. You might check the lamp hours - you can find this in the advanced menu. Also check the air filter, if you haven't cleaned it, the airflow might be restricted, shutting down the projector.
Filter massage
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Sounds it is time for new lamp in projector.
How old is your projector and did you replaced its lamp?
projector runs for a minute and cuts off and lamp light comes on
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