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I just thought - for another reason it might happen - the lamp fixture says 300W - check your lamp for power - if it is close to 300W - try changing it to 250 max.

I agree

I would guess, that you might want to check the quality and the source of the heat lamps. The reason it might happen - could be non reliable glass quality of the lamp or the lamp is overheating significantly - maybe it is too close to the floor, or not intended for the volage of your power...