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This usually indicates that the lamp is overheating – not that it's gone bad. What I would suggest doing is vacuuming out the vents and using compressed air to make sure that they are cleared out completely. It is likely that one of the vents is blocked and after a couple of minutes the temperature gets too high and it turns off. If that's not it or if you still have questions, please let me know.
My ScreenPlay by Infocus would not power down with the
A projector located in a church suddenly will no longer